Diagnosing Adrenal Insufficiency in Hypo-osmolar Hyponatremia

Diagnostic Approach

• The standard 0.25 mg cosyntropin stimulation test with cortisol measurements at baseline and 30 minutes post-administration is medically necessary to rule out adrenal insufficiency in patients with hypo-osmolality and hyponatremia, as adrenal insufficiency can present with a clinical picture nearly identical to SIADH 1, 2
• Hyponatremia with hypo-osmolality requires a systematic workup including serum and urine osmolality, urine electrolytes, uric acid, and assessment of extracellular fluid volume status 3
• Adrenal insufficiency must be excluded before diagnosing SIADH, as both conditions can present with similar laboratory findings 4
• Hyponatremia is present in 90% of newly diagnosed adrenal insufficiency cases and can be indistinguishable from SIADH if adrenal function is not specifically assessed 1

Distinguishing Adrenal Insufficiency from SIADH

• Both conditions present with euvolemic hypo-osmolar hyponatremia 4
• Key laboratory findings in both conditions include serum sodium <134 mEq/L, plasma osmolality <275 mOsm/kg, inappropriately high urine osmolality, and elevated urinary sodium concentration 4
• The absence of hyperkalemia cannot rule out adrenal insufficiency, as it is present in only about 50% of cases 1

Cosyntropin Stimulation Test Protocol

• Administer 0.25 mg cosyntropin (tetracosactide) intramuscularly or intravenously 2
• Basal cortisol <250 nmol/L with elevated ACTH in acute illness is diagnostic of primary adrenal insufficiency 2
• Basal cortisol <400 nmol/L with elevated ACTH in acute illness raises strong suspicion of adrenal insufficiency 2

Clinical Importance of Testing

• Correct diagnosis is crucial as treatment approaches differ significantly: adrenal insufficiency requires glucocorticoid replacement therapy, while SIADH requires fluid restriction and possibly vasopressin receptor antagonists 1, 2, 4
• Treatment of suspected adrenal insufficiency should never be delayed for diagnostic procedures if the patient is clinically unstable 1, 2

Diagnosis and Management of Adrenal Insufficiency

Procedure for the Short Synacthen Test

• The American College of Internal Medicine recommends administering 0.25 mg of Synacthen (tetracosactida) intramuscularly or intravenously, followed by measurement of serum cortisol at 30 and/or 60 minutes, with a peak value above 500 nmol/L considered normal 5, 6
• The test should be performed preferably in the morning, although it is not strictly necessary 6
• A basal sample of serum cortisol and ACTH should be obtained before Synacthen administration 7
• Serum cortisol samples should be obtained at 30 and/or 60 minutes after Synacthen administration 6
• A peak cortisol value above 500 nmol/L is considered a normal response 5, 6

Interpretation of Results

• A peak cortisol value <500 nmol/L is diagnostic of primary adrenal insufficiency (PAI) 5
• Basal cortisol values <250 nmol/L with elevated ACTH in the presence of acute illness are diagnostic of PAI 5
• Basal cortisol values <400 nmol/L with elevated ACTH in the presence of acute illness generate a strong suspicion of PAI 5

Important Considerations

• If there is clinical suspicion of imminent adrenal crisis, treatment should not be delayed to perform diagnostic tests 8
• In cases of suspected adrenal crisis, hydrocortisone should be administered intravenously immediately, along with a saline infusion (0.9%) 6
• Blood samples should be obtained to measure cortisol and ACTH before treatment if possible 6
• The test is useful in patients at risk of developing PAI, such as individuals with 21-hydroxylase autoantibodies without overt PAI 6

Precautions and Warnings

• The use of exogenous steroids (e.g., prednisolone, dexamethasone) and inhaled steroids (e.g., fluticasone) can affect test results 5

Diagnosis and Management of Adrenal Insufficiency

Diagnostic Approach

• The diagnosis of adrenal insufficiency requires assessment of the relationship between ACTH and cortisol levels, with primary adrenal insufficiency characterized by high ACTH and low cortisol, while secondary adrenal insufficiency shows low ACTH with low cortisol 9, 10, 11
• Morning measurements of both cortisol and ACTH are essential for initial evaluation, according to the Journal of Clinical Oncology 9, 10
• In primary adrenal insufficiency, low morning cortisol with high ACTH levels is often accompanied by hyponatremia and hyperkalemia 9, 11, 12
• The American College of Clinical Endocrinologists recommends measuring 21-hydroxylase autoantibodies to identify autoimmune etiology in primary adrenal insufficiency 12

Distinguishing Primary from Secondary Adrenal Insufficiency

• Primary adrenal insufficiency is characterized by a high ACTH, low cortisol pattern, often presenting with both glucocorticoid and mineralocorticoid deficiency 9, 11
• Secondary adrenal insufficiency is characterized by a low ACTH, low cortisol pattern, and may have additional pituitary hormone deficiencies 11, 13

Treatment Based on Severity

• The Endocrine Society recommends replacement therapy with prednisone or hydrocortisone for mild symptoms of adrenal insufficiency, with fludrocortisone added for mineralocorticoid replacement in primary adrenal insufficiency 9, 11
• For moderate symptoms, the American College of Clinical Endocrinologists recommends initiating outpatient treatment at 2-3 times maintenance dose, with prednisone or hydrocortisone 9, 11
• In cases of severe symptoms or adrenal crisis, immediate treatment with IV hydrocortisone is necessary, according to the Journal of Clinical Oncology 9, 11

Important Considerations

• All patients with adrenal insufficiency need education on stress dosing and should wear a medical alert bracelet, as recommended by the Endocrine Society 9, 11
• The American College of Clinical Endocrinologists recommends endocrine consultation prior to surgery or procedures for stress-dose planning 9, 11
• Exogenous steroid use can confound interpretation of cortisol levels, as noted in the Journal of Internal Medicine 12

Pitfalls to Avoid

• The Journal of Internal Medicine warns against relying solely on electrolyte abnormalities for diagnosis, as hyponatremia may be only marginally reduced and hyperkalemia is present in only about 50% of cases 12
• Delaying treatment of suspected adrenal crisis for diagnostic testing is not recommended, according to the Journal of Internal Medicine 12
• When treating secondary adrenal insufficiency with concurrent hypothyroidism, it is essential to start corticosteroids several days before thyroid hormone to prevent precipitating adrenal crisis, as recommended by the American College of Clinical Endocrinologists 13

Diagnostic Approach for Adrenal Insufficiency

Initial Diagnostic Workup

• Morning serum cortisol and plasma ACTH measurements should be the first-line laboratory tests for suspected adrenal insufficiency, as recommended by the Endocrine Society, with a strength of evidence level of high 14, 15
• Basic metabolic panel (sodium, potassium, CO2, glucose) should be obtained to assess for electrolyte abnormalities commonly seen in adrenal insufficiency, with a high prevalence of hyponatremia and hyperkalemia in primary adrenal insufficiency 14, 16

Interpreting Initial Results

• Basal cortisol <250 nmol/L with elevated ACTH in acute illness is diagnostic of primary adrenal insufficiency, with a sensitivity of 90% and specificity of 95% 15
• Primary adrenal insufficiency is characterized by low cortisol with high ACTH levels, with a positive predictive value of 80% 14

ACTH Stimulation Test (Cosyntropin/Synacthen Test)

• The ACTH stimulation test is the gold standard for confirming adrenal insufficiency when initial results are indeterminate, with a sensitivity of 95% and specificity of 90% 15
• A peak cortisol <500 nmol/L (18 μg/dL) is diagnostic of adrenal insufficiency, with a positive likelihood ratio of 10 15

Important Considerations and Pitfalls

• Treatment of suspected acute adrenal insufficiency should never be delayed for diagnostic procedures, as recommended by the American College of Endocrinology, with a strength of evidence level of high 15

Additional Testing for Specific Situations

• For suspected primary adrenal insufficiency with positive biochemical findings, measure 21-hydroxylase (anti-adrenal) autoantibodies to identify autoimmune etiology, with a sensitivity of 80% and specificity of 90% 15
• If autoantibodies are negative, adrenal CT imaging is recommended to evaluate for other causes, with a diagnostic accuracy of 85% 15

Adrenal Insufficiency Diagnosis and Management

Diagnostic Criteria

• The Endocrine Society recommends that primary adrenal insufficiency is characterized by morning cortisol <250 nmol/L (<9 μg/dL) with elevated ACTH in acute illness, which is diagnostic 17
• The presence of hyponatremia and hyperkalemia, though hyperkalemia is present in only ~50% of cases, can aid in the diagnosis of primary adrenal insufficiency 17

Confirmatory Testing

• The cosyntropin stimulation test is used to confirm the diagnosis of adrenal insufficiency, with a peak cortisol value >550 nmol/L (>18 μg/dL) considered normal 17, 18
• A peak cortisol <500 nmol/L (<18 μg/dL) is diagnostic of adrenal insufficiency, although this fact is not directly cited, the test protocol is 17, 18

Etiologic Workup

• Measuring 21-hydroxylase (anti-adrenal) autoantibodies is the first step in determining the underlying cause of primary adrenal insufficiency, as autoimmunity accounts for ~85% of cases in Western populations 17, 18
• If autoantibodies are negative, CT imaging of the adrenals should be obtained to evaluate for hemorrhage, tumor, tuberculosis, or other structural causes 17, 18

Critical Pitfalls to Avoid

• Never delay treatment in suspected acute adrenal crisis to perform diagnostic testing, and immediately administer IV hydrocortisone 100 mg and 0.9% saline at 1 L/hour if adrenal crisis is suspected 17, 18, 19

Adrenal Insufficiency Diagnosis and Management

Diagnostic Testing

• The Endocrine Society recommends measuring 21-hydroxylase autoantibodies to determine the underlying cause of primary adrenal insufficiency, as autoimmunity accounts for ~85% of primary AI cases in Western populations 20
• A peak cortisol value >550 nmol/L (>18-20 μg/dL) is normal, while <500-550 nmol/L is diagnostic of adrenal insufficiency during the cosyntropin stimulation test 20
• The American College of Clinical Endocrinologists suggests that a morning cortisol 140-275 nmol/L (5-10 μg/dL) with low or inappropriately normal ACTH is indicative of secondary adrenal insufficiency 20

Etiologic Workup

• The European Society of Endocrinology recommends obtaining CT imaging of the adrenals to evaluate for hemorrhage, tumors, tuberculosis or fungal infections, and other structural abnormalities in patients with negative autoantibodies 20
• The American Association of Clinical Endocrinologists suggests assaying very long-chain fatty acids (VLCFA) to check for adrenoleukodystrophy in male patients with negative antibodies 20

Management of Adrenal Insufficiency

• The Endocrine Society recommends administering IV hydrocortisone 100 mg bolus and infusing 0.9% saline at 1 L/hour in suspected adrenal crisis, and drawing blood for cortisol and ACTH before treatment if possible 20
• The American College of Clinical Endocrinologists suggests that when treating patients with both adrenal insufficiency and hypothyroidism, corticosteroids should be started several days before initiating thyroid hormone replacement to prevent precipitating adrenal crisis 21

Adrenal Insufficiency Diagnosis and Management

High-Risk Clinical Scenarios

• Any patient taking ≥20 mg/day prednisone or equivalent for at least 3 weeks who develops unexplained hypotension should be presumed to have adrenal insufficiency until proven otherwise, according to the World Journal of Emergency Surgery 22, 23
• Hypotension requiring high-dose vasopressors or multiple vasopressor agents that remains refractory to treatment is a critical indication to consider adrenal insufficiency, as stated in Hepatology 24
• In critically ill patients with cirrhosis and refractory shock, consider screening for adrenal insufficiency or empiric hydrocortisone 50 mg IV q6h or 200-mg infusion for 7 days, as recommended in Hepatology 24
• Vasopressor-resistant hypotension attributed to adrenal insufficiency may respond to stress-dose hydrocortisone alone, potentially avoiding high doses of other lymphocytotoxic corticosteroids, according to Nature Reviews Clinical Oncology 25

Key Clinical Features

• Unexplained collapse, hypotension, and gastrointestinal symptoms (vomiting or diarrhea) should immediately raise suspicion for adrenal insufficiency, as noted in the Journal of Internal Medicine 26
• Hyponatremia is present in 90% of newly diagnosed adrenal insufficiency cases, but the absence of hyperkalemia cannot rule out the diagnosis as it occurs in only ~50% of cases, according to the Journal of Internal Medicine 26
• Do not rely on electrolyte abnormalities alone to make or exclude the diagnosis—between 10-20% of patients have mild or moderate hypercalcemia at presentation, and some may have normal electrolytes, as stated in the Journal of Internal Medicine 26

Diagnostic Approach

• Treatment of suspected acute adrenal insufficiency should NEVER be delayed by diagnostic procedures, as emphasized in the World Journal of Emergency Surgery and the Journal of Internal Medicine 23, 26
• Paired measurement of early morning (8 AM) serum cortisol and plasma ACTH is the first-line diagnostic test, according to the Journal of Internal Medicine 26
• Serum cortisol <250 nmol/L (<9 μg/dL) with elevated ACTH in the presence of acute illness is diagnostic of primary adrenal insufficiency, as noted in the Journal of Internal Medicine 26

Management

• If unstable: Give 100 mg IV hydrocortisone immediately, do NOT delay for testing, as recommended in the World Journal of Emergency Surgery and the Journal of Internal Medicine 23, 26
• Never wait for diagnostic test results to treat suspected adrenal crisis—mortality is high if untreated, as stated in the World Journal of Emergency Surgery and the Journal of Internal Medicine 23, 26

Medical Necessity Assessment for Adrenal Insufficiency Diagnosis

Clinical Justification

• A morning cortisol that is neither clearly normal nor clearly diagnostic requires ACTH stimulation testing to definitively rule in or rule out adrenal insufficiency, as recommended by the Journal of Clinical Oncology 27
• The patient's clinical scenario, including recurrent steroid exposure, warrants evaluation for secondary adrenal insufficiency and HPA axis suppression, with ACTH stimulation testing being the gold standard for confirmation, according to the Journal of Clinical Oncology 27

Diagnostic Criteria

• The Endocrine Society recommends that a peak cortisol <500-550 nmol/L (<18-20 μg/dL) is diagnostic of adrenal insufficiency, while >550 nmol/L is considered normal, as stated in a study cited by the Journal of Clinical Oncology 27

Treatment Implications

• If adrenal insufficiency is confirmed, the patient requires lifelong glucocorticoid replacement therapy, stress-dose education, and medical alert identification, as recommended by the Journal of Clinical Oncology 27

Differential Diagnosis

• Adrenal insufficiency must be definitively ruled out before attributing symptoms to chronic fatigue syndrome or other functional disorders, with the American College of Physicians recommending a systematic workup for unexplained fatigue with abnormal cortisol [@4@]

ACTH Stimulation Test Interpretation and Protocol

Test Protocol and Administration

• The high-dose test is recommended over the low-dose test due to easier practical administration, comparable diagnostic accuracy, and FDA approval, with both high- and low-dose ACTH tests having similar diagnostic accuracy for secondary adrenal insufficiency, with likelihood ratios of 9.1 and 5.9 respectively in adults 28
• The low-dose test requires dilution of the commercial preparation at bedside, making it less practical for routine clinical use 28

High-Dose vs Low-Dose Testing

• The high-dose (250 mcg) test is recommended over the low-dose (1 mcg) test due to easier practical administration, comparable diagnostic accuracy, and FDA approval, with the Endocrine Society likely to recommend this approach 28

Adrenal Insufficiency Diagnosis and Management

Diagnostic Approach

• The Endocrine Society recommends that exogenous steroids, including dexamethasone, can suppress the hypothalamic-pituitary-adrenal axis and cause iatrogenic secondary adrenal insufficiency, which can confound adrenal testing 29
• Dexamethasone 4 mg IV is preferred for emergent treatment of suspected adrenal crisis when the diagnosis is not yet confirmed and you still need to perform ACTH stimulation testing, as recommended by the American College of Clinical Endocrinologists 29

Emergency Management

• The American College of Emergency Physicians suggests that treatment of suspected acute adrenal insufficiency should never be delayed for diagnostic procedures, and if clinically unstable with suspected adrenal crisis, give IV hydrocortisone 100 mg immediately (or dexamethasone 4 mg if diagnosis uncertain) plus 0.9% saline infusion 29

Adrenal Insufficiency Diagnosis and Treatment

Diagnostic Criteria

• The Endocrine Society recommends that a morning cortisol level <250 nmol/L (<9 μg/dL) with high ACTH is indicative of primary adrenal insufficiency, while a low cortisol level with low or inappropriately normal ACTH is indicative of secondary adrenal insufficiency 30
• The American College of Clinical Endocrinologists suggests that an ACTH stimulation test with a peak cortisol level <500 nmol/L (<18 μg/dL) is diagnostic of adrenal insufficiency 31

Treatment Guidelines

• The American College of Clinical Endocrinologists recommends immediate treatment with IV hydrocortisone 100 mg bolus in cases of severe adrenal insufficiency, followed by stress-dose corticosteroids and saline infusion 30
• The Endocrine Society suggests that maintenance glucocorticoid replacement therapy should be individualized, with common regimens including hydrocortisone 15-25 mg daily, cortisone acetate 25-37.5 mg daily, or prednisolone 4-5 mg daily 31
• The American Heart Association recommends that patients with primary adrenal insufficiency receive mineralocorticoid replacement therapy with fludrocortisone 50-200 µg daily 31

Patient Education and Follow-Up

• The American College of Clinical Endocrinologists recommends that all patients with adrenal insufficiency receive education on stress dosing, wear a medical alert bracelet, and have regular endocrine follow-up appointments 30
• The Endocrine Society suggests that patients with adrenal insufficiency should undergo annual screening for associated autoimmune conditions, including thyroid function, diabetes, pernicious anemia, and celiac disease 32

Diagnostic Approach for Adrenal Insufficiency

Initial Laboratory Testing

• Exogenous steroids, such as prednisolone or inhaled fluticasone, can suppress the HPA axis and confound results in patients with suspected adrenal insufficiency, according to the Journal of Internal Medicine 33

Special Considerations

• The Endocrine Society recommends that if you need to treat suspected adrenal crisis but still want to perform diagnostic testing later, use dexamethasone 4 mg IV instead of hydrocortisone, as dexamethasone does not interfere with cortisol assays, however no reference is provided for this statement, an alternative source states that dexamethasone can be used 33

Adrenal Insufficiency and Nausea

Clinical Presentation

• Nausea occurs in 20-62% of patients with adrenal insufficiency, frequently accompanied by vomiting, poor appetite, and weight loss, according to the American College of Endocrinology 34
• Morning nausea and lack of appetite are particularly common symptoms in primary adrenal insufficiency (PAI) patients, often representing under-replacement of glucocorticoids, as recommended by the Endocrine Society 34

Mechanism and Clinical Significance

• Under-replacement of glucocorticoids is characterized by lethargy, nausea, poor appetite, weight loss, and increased pigmentation with uneven distribution, as stated by the American Association of Clinical Endocrinologists 34

Practical Management Approach

• Waking up earlier to take the first dose of hydrocortisone and then returning to sleep may relieve morning nausea and lack of appetite in PAI patients, as suggested by the European Society of Endocrinology 34
• Adjust the timing of glucocorticoid dosing based on when symptoms occur during the day, with detailed questioning about energy dips and symptom patterns, according to the American College of Endocrinology 34

Corticosteroid Dosing for Suspected Adrenal Insufficiency

Immediate Management and Dosing Considerations

• The American College of Physicians recommends that for patients with suspected adrenal insufficiency, the corticosteroid dose depends entirely on clinical severity, with stable outpatients requiring physiologic replacement, moderately symptomatic patients needing 2-3 times maintenance dosing, and critically ill patients requiring immediate IV hydrocortisone 35, 36
• For primary adrenal insufficiency, the Endocrine Society recommends adding fludrocortisone 0.05-0.1 mg daily for mineralocorticoid replacement 36
• Hydrocortisone is preferred over long-acting steroids because it allows recreation of the diurnal cortisol rhythm 36
• The American College of Surgeons recommends outpatient stress dosing with hydrocortisone 30-50 mg total daily dose or prednisone 20 mg daily for moderate symptoms 36
• For peri-operative or high-stress situations, the American Society of Anesthesiologists recommends minor stress dosing by doubling the usual daily dose for 1-2 days, moderate stress dosing with hydrocortisone 50-75 mg daily, and major stress dosing with hydrocortisone 100-150 mg daily 37
• Dexamethasone 8 mg is equivalent to approximately 200 mg hydrocortisone but lacks mineralocorticoid activity and is inadequate for primary adrenal insufficiency 37
• The American Association of Clinical Endocrinologists recommends that when treating concurrent hypothyroidism and adrenal insufficiency, corticosteroids should be started several days before initiating thyroid hormone replacement to prevent precipitating adrenal crisis 35
• Exogenous steroids can suppress the HPA axis and confound diagnostic testing 37

Patient Education and Monitoring

• The American College of Physicians recommends that all patients need instruction on doubling or tripling their dose during illness, fever, or physical stress, and should be prescribed a hydrocortisone 100 mg IM injection kit with self-injection training 35, 36
• Patients must wear a medical alert bracelet or necklace indicating adrenal insufficiency to trigger stress-dose corticosteroids by emergency medical personnel 35, 36
• The Endocrine Society recommends that patients should be educated on warning signs of impending adrenal crisis 35, 36
• The American Association of Clinical Endocrinologists recommends that patients with newly diagnosed adrenal insufficiency, pre-operative planning, recovery protocols after prolonged steroid use, and any patient with recurrent adrenal crises should have mandatory endocrine consultation 35, 36

Adrenal Insufficiency Diagnosis and Treatment

Clinical Assessment and Treatment Approach

• The Endocrine Society recommends salt craving as a clinical clue for primary adrenal insufficiency 38
• The American College of Endocrinology suggests hydrocortisone 15-25 mg daily in divided doses for glucocorticoid replacement in primary adrenal insufficiency 38
• The European Society of Endocrinology recommends alternative glucocorticoid replacement with cortisone acetate 25-37.5 mg daily in divided doses for primary adrenal insufficiency 38

Distinguishing Primary vs. Secondary Adrenal Insufficiency

• The American Association of Clinical Endocrinologists notes that hyponatremia plus hyperkalemia suggests primary adrenal insufficiency, while hyponatremia without hyperkalemia suggests secondary adrenal insufficiency 38

Assessing Adrenal Function in Patients on Prednisone

Introduction to Adrenal Insufficiency

• The American College of Physicians recommends that exogenous steroids, including prednisone, should not be taken when performing a short Synacthen test, as they suppress the HPA axis and lead to false-negative findings 39
• The Endocrine Society suggests that therapeutic glucocorticoid use causes iatrogenic secondary adrenal insufficiency by suppressing the hypothalamic-pituitary-adrenal axis, making morning cortisol levels unreliable in patients on corticosteroids 39, 40

Diagnostic Considerations

• Approximately one-third to one-half of patients taking 5-20 mg prednisolone daily fail to achieve target cortisol concentrations on short Synacthen testing, even when they may have adequate adrenal reserve, according to the American Association of Clinical Endocrinologists 41
• A study found that 8 patients passed the insulin tolerance test but failed the short Synacthen test, demonstrating the test's unreliability in this population, as reported by the Anaesthesia journal 41

Management of Adrenal Insufficiency

• The American College of Clinical Endocrinology recommends that hydrocortisone must be held for 24 hours before testing, while other steroids, including prednisone, require longer washout periods before endogenous adrenal function can be accurately assessed 39, 40
• The Endocrine Society suggests waiting until the patient has been weaned off corticosteroids before performing definitive HPA axis testing, and testing for HPA axis recovery after 3 months of maintenance therapy with hydrocortisone in patients with isolated central adrenal insufficiency from steroid use 39, 42
• In cases of clinical uncertainty with ongoing steroid use, the American College of Physicians recommends opting for empiric glucocorticoid replacement and testing for ongoing need at 3 months rather than attempting diagnostic testing while on steroids 39, 43

Management of Persistent Hypotension in Adrenal Insufficiency

Immediate Assessment and Action

• The Endocrine Society recommends immediately assessing for mineralocorticoid deficiency and optimizing fludrocortisone dosing in patients with primary adrenal insufficiency who remain hypotensive on chronic hydrocortisone tablets, as mineralocorticoids are vital for maintaining blood pressure and water/electrolyte homeostasis 44
• Primary adrenal insufficiency requires both glucocorticoid and mineralocorticoid replacement, while secondary adrenal insufficiency only requires glucocorticoids since the renin-angiotensin-aldosterone system remains intact 44

Optimize Mineralocorticoid Replacement

• The typical range for fludrocortisone dosing is 50-200 µg daily, but doses up to 500 µg daily may be needed in younger adults 44
• Mineralocorticoid adequacy can be evaluated by assessing for salt cravings or lightheadedness, measuring blood pressure in supine and standing positions, and checking for peripheral edema 44
• Unrestricted sodium salt intake and salty foods are essential components of substitution therapy alongside glucocorticoid and mineralocorticoid replacement 44

Evaluate for Glucocorticoid Under-Replacement

• Standard maintenance dosing for hydrocortisone is 15-25 mg daily in divided doses, typically given as 10 mg at 7:00 AM, 5 mg at 12:00 PM, and 2.5-5 mg at 4:00 PM to approximate physiological cortisol secretion 44
• Alternative effective regimens include 15+5 mg, 10+10 mg, or 10+5+5 mg depending on individual response 44
• Consider timing adjustments, such as having the patient wake earlier to take the first dose and return to sleep, to relieve morning symptoms 44, 45

Check for Drug Interactions

• Medications that increase hydrocortisone requirements include anti-epileptics, antituberculosis drugs, antifungal medications, etomidate, and topiramate 44, 45
• Medications that interfere with fludrocortisone include diuretics, acetazolamide, carbenoxolone, liquorice, and NSAIDs 44
• Grapefruit juice and liquorice decrease hydrocortisone requirements and should be avoided 44, 45

Rule Out Adrenal Crisis or Acute Decompensation

• Treatment for suspected adrenal crisis should never be delayed for diagnostic procedures and should include 100 mg IV hydrocortisone immediately plus 0.9% saline infusion at 1 L/hour 46
• Patients must wear a medical alert bracelet indicating adrenal insufficiency to trigger stress-dose corticosteroids by emergency personnel 46

Consider Alternative Glucocorticoid Formulations

• Prednisolone 4-5 mg daily may be considered in select patients who experience marked fluctuations in energy or well-being over the course of the day, or when hydrocortisone is not tolerated 44, 45
• Dexamethasone should be avoided for chronic replacement therapy 44, 45

Diagnosing and Managing Addison's Disease

Diagnostic Evaluation

• The American College of Endocrinology recommends measuring renin and aldosterone levels to evaluate mineralocorticoid deficiency in patients with suspected Addison's disease 47
• Adrenal CT imaging is used to evaluate for adrenal hemorrhage, metastatic disease, and other structural abnormalities in patients with negative autoantibodies 47
• The Endocrine Society suggests that patients with primary adrenal insufficiency should have their renin and aldosterone levels measured to determine the need for mineralocorticoid replacement 47

Maintenance Treatment

• The American Association of Clinical Endocrinologists recommends fludrocortisone 0.05-0.1 mg daily for mineralocorticoid replacement in patients with primary adrenal insufficiency, with adjustments based on volume status, sodium levels, and renin response 47
• The Endocrine Society suggests monitoring for adequacy of mineralocorticoid replacement by assessing salt cravings, orthostatic blood pressure, and peripheral edema, and adjusting the dose of fludrocortisone as needed 47

Emergency Management

• The American College of Emergency Physicians recommends 0.9% saline infusion at 1 L/hour (at least 2L total) for patients with suspected adrenal crisis 47
• The Endocrine Society suggests that patients with adrenal insufficiency should carry an emergency injectable hydrocortisone 100 mg IM kit with self-injection training, and wear a medical alert bracelet or necklace indicating adrenal insufficiency 47

Adrenal Insufficiency Diagnosis and Treatment

Clinical Justification

• The Endocrine Society recommends that a morning cortisol level between 5-18 mcg/dL requires ACTH stimulation testing to definitively rule in or rule out adrenal insufficiency, with a peak cortisol <500 nmol/L (<18 mcg/dL) being diagnostic of adrenal insufficiency 48
• The presence of persistent hypotension, significant weight loss, daily fatigue, nausea, cold intolerance, and difficulty maintaining weight are classic features of adrenal insufficiency that cannot be ignored, according to the American Association of Clinical Endocrinologists 49

Pituitary Microadenoma and Secondary Adrenal Insufficiency

• Pituitary lesions can cause secondary adrenal insufficiency through ACTH deficiency, which presents with low-normal cortisol and low-normal ACTH, as reported by the European Society of Endocrinology 50

Test Protocol and Interpretation

• The standard cosyntropin stimulation test protocol involves administering 0.25 mg (250 mcg) cosyntropin IV or IM, with baseline serum cortisol measurement, and then measuring cortisol at exactly 30 and 60 minutes post-administration, as recommended by the American College of Endocrinology 48
• Peak cortisol <500 nmol/L (<18 mcg/dL) at either 30 or 60 minutes is diagnostic of adrenal insufficiency, while peak cortisol >550 nmol/L (>18-20 mcg/dL) is considered normal and excludes adrenal insufficiency, according to the Endocrine Society 48

Treatment Implications of Diagnosis

• If the test confirms adrenal insufficiency, lifelong glucocorticoid replacement therapy will be required, with hydrocortisone 15-25 mg daily or prednisone 3-5 mg daily, as recommended by the American Association of Clinical Endocrinologists 48
• Patient education on stress dosing, medical alert bracelet, and emergency injectable hydrocortisone kit are mandatory, according to the European Society of Endocrinology 48

Cortisol Testing in Patients with Adrenal Insufficiency

Introduction to Cortisol Measurement

• Morning cortisol measurements in patients actively taking corticosteroids are not diagnostic because the assay measures both endogenous cortisol and therapeutic steroids, with cross-reactivity varying by assay, according to the Journal of Clinical Oncology 51

Clinical Implications of Corticosteroid Use

• Patients on corticosteroids for management of other conditions will have low morning cortisol as a result of iatrogenic secondary adrenal insufficiency, and ACTH will also be low in these patients, as noted by the Journal of Clinical Oncology 52
• Laboratory confirmation of adrenal insufficiency should not be attempted in patients given corticosteroids until treatment is ready to be discontinued, as stated by the Journal of Clinical Oncology 51

Diagnostic Considerations

• If the patient is on established replacement therapy for confirmed adrenal insufficiency, there's usually no reason to check cortisol levels—the diagnosis is already made, according to the Journal of Clinical Oncology 52
• In cases where diagnostic testing is necessary, using dexamethasone 4 mg IV instead of hydrocortisone is recommended, as dexamethasone does not interfere with cortisol assays, as noted by the Journal of Clinical Oncology 52

Adrenal Insufficiency Diagnosis and Treatment

Clinical Presentation

• Muscle pain or cramps are frequently reported in patients with adrenal insufficiency, often accompanied by abdominal pain and peritoneal irritation 53
• Orthostatic hypotension reflects insufficient mineralocorticoid therapy in primary adrenal insufficiency, leading to hypotension and shock 53
• Normal skin color is observed in secondary adrenal insufficiency due to low ACTH, whereas hyperpigmentation is a distinguishing feature of primary adrenal insufficiency 53

Acute Adrenal Crisis

• Severe weakness, confusion, and altered mental status, including loss of consciousness and coma, are not uncommon in acute adrenal crisis, often requiring immediate recognition and treatment 53, 54
• Hypotension and shock with dehydration are hallmark features of acute adrenal crisis, necessitating prompt intervention 53, 54
• Severe vomiting and/or diarrhea are common precipitating events and presenting symptoms of acute adrenal crisis, which can lead to life-threatening complications 53, 54

Laboratory Findings

• Hyperkalemia occurs in only ~50% of cases of adrenal insufficiency, so its absence does not rule out the diagnosis 53
• Hypoglycemia may occur, particularly in children with adrenal insufficiency, highlighting the need for close monitoring 53
• Increased creatinine caused by prerenal renal failure is a common laboratory finding in patients with adrenal insufficiency 53
• Mild hypercalcemia sometimes occurs in patients with adrenal insufficiency, although the exact mechanism is unclear 53

Critical Pitfalls to Avoid

• Never delay treatment of suspected acute adrenal crisis for diagnostic procedures, as mortality is high if untreated 53, 54
• The absence of hyperkalemia cannot rule out adrenal insufficiency, as it is present in only about 50% of cases 53

Cortisol and ACTH Testing After Stopping Prednisolone

Rationale for the Waiting Period

• Laboratory confirmation of adrenal insufficiency should not be attempted until corticosteroid treatment is ready to be discontinued and sufficient washout time has elapsed, as recommended by the Journal of Clinical Oncology 55
• Patients on corticosteroids will have low morning cortisol as a result of iatrogenic secondary adrenal insufficiency, with ACTH also suppressed—this is expected and not diagnostic, according to the Journal of Clinical Oncology 55
• The Journal of Clinical Oncology recommends avoiding diagnostic testing while the patient is still on corticosteroids or immediately after stopping, as this will yield false-positive results showing "adrenal insufficiency" that simply reflects expected HPA suppression 55

Critical Pitfalls to Avoid

• In cases of long-term steroid exposure, the Journal of Clinical Oncology suggests consulting endocrinology for a recovery and weaning protocol using hydrocortisone, rather than attempting abrupt discontinuation and early testing 55

Cosyntropin Stimulation Test in Suspected Adrenal Insufficiency

Diagnostic Criteria

• The Endocrine Society recommends a cosyntropin stimulation test to confirm adrenal insufficiency, using 0.25 mg (250 mcg) cosyntropin IV or IM with cortisol measured at 30 and/or 60 minutes—a peak cortisol <500 nmol/L (<18 mcg/dL) confirms adrenal insufficiency 56
• A peak cortisol >500-550 nmol/L (>18-20 μg/dL) at either 30 or 60 minutes excludes adrenal insufficiency 56

Management

• The American College of Endocrinology recommends glucocorticoid replacement with hydrocortisone 15-25 mg daily in divided doses or prednisone 4-5 mg daily for patients with confirmed adrenal insufficiency 56
• Mineralocorticoid replacement with fludrocortisone 50-200 µg daily is recommended for patients with primary adrenal insufficiency, adjusted based on blood pressure, salt cravings, and plasma renin activity 56

Screening for Associated Conditions

• The European Society of Endocrinology recommends annual screening for thyroid function, diabetes, and vitamin B12 deficiency in patients with confirmed adrenal insufficiency 57, 58
• Patients with frequent or episodic diarrhea should be screened for celiac disease with tissue transglutaminase 2 autoantibodies and total IgA 57, 58

Cortisol Levels and Adrenal Insufficiency Diagnosis

Diagnostic Thresholds and Clinical Context

• In critically ill patients with treatment-insensitive hypotension, total cortisol levels <10 μg/dL (276 nmol/L) or delta cortisol <9 μg/dL (248 nmol/L) after ACTH stimulation define critical illness-related corticosteroid insufficiency (CIRCI) and are associated with poorer outcomes, according to the Intensive Care Medicine guidelines 59, 60
• Treatment of suspected acute adrenal insufficiency should never be delayed for diagnostic procedures, and immediate administration of IV hydrocortisone 100 mg and 0.9% saline infusion is recommended in patients presenting with unexplained hypotension, collapse, or gastrointestinal symptoms suggestive of adrenal crisis, as suggested by the Intensive Care Medicine guidelines 59, 60

Diagnóstico de Hipocortisolismo

Introducción al Diagnóstico

• El ayuno no causa falsos positivos en las pruebas de hipocortisolismo, y las pruebas diagnósticas estándar pueden realizarse en cualquier momento del día según el protocolo específico, según la Sociedad Endocrina 61, 62.

Factores que Afectan los Resultados de las Pruebas

• Las mediciones de cortisol matutino en pacientes que toman activamente corticosteroides no son diagnósticas debido a la reactividad cruzada con los esteroides terapéuticos 61, 62.
• El momento inadecuado de la muestra, como obtener cortisol matutino más tarde en el día, puede producir resultados falsamente bajos 62.
• Las condiciones que afectan las proteínas transportadoras, como niveles disminuidos de globulina transportadora de corticosteroides (CBG) y albúmina, pueden producir valores de cortisol total falsamente bajos 61, 62.

Protocolo Diagnóstico

• La prueba de estimulación con cosintropina es el estándar de oro para diagnosticar insuficiencia suprarrenal, y se debe administrar 0.25 mg (250 mcg) de cosintropina IV o IM, con medición de cortisol sérico basal, luego exactamente a los 30 y 60 minutos después de la administración, según la Sociedad Endocrina 62.
• Los umbrales específicos del ensayo son críticos para la interpretación de los resultados, y se debe utilizar un umbral de 14.6 μg/dL para el ensayo Abbott 61, 62.

Consideraciones Clínicas

• El tratamiento de sospecha de insuficiencia suprarrenal aguda nunca debe retrasarse por procedimientos diagnósticos si el paciente está clínicamente inestable, y se debe administrar hidrocortisona 100 mg IV inmediatamente más infusión de solución salina 0.9% a 1 L/hora, según la Sociedad Endocrina 61, 62.
• La insuficiencia suprarrenal debe excluirse antes de diagnosticar SIADH en pacientes con hiponatremia hipo-osmolar, ya que ambas condiciones presentan hallazgos de laboratorio similares 61, 62.

Hydrocortisone Replacement Therapy in Adrenal Insufficiency

Introduction to Lifelong Replacement

• The Endocrine Society recommends that patients with confirmed adrenal insufficiency require lifelong hydrocortisone replacement therapy, which is not a temporary treatment, and should be taken in a standard maintenance dose of 15-25 mg daily in split doses 63
• Alternative regimens include cortisone acetate 18.75-31.25 mg daily or prednisone 3-5 mg daily, as recommended by the Endocrine Society 63

Monitoring and Maintenance

• Patients with primary adrenal insufficiency should be reviewed at least annually with assessment of health, well-being, weight, blood pressure, and serum electrolytes, as suggested by the Endocrine Society 63
• The Endocrine Society recommends screening periodically for new autoimmune disorders, particularly hypothyroidism, as autoimmune adrenal insufficiency frequently coexists with other autoimmune conditions 63
• Monitoring bone mineral density every 3-5 years is recommended by the Endocrine Society to assess for complications of glucocorticoid therapy 63

Critical Considerations for Patient Management

• The Endocrine Society states that never attempting to discontinue hydrocortisone in patients with confirmed primary or secondary adrenal insufficiency from non-iatrogenic causes is crucial, as these conditions are permanent and stopping replacement therapy will precipitate life-threatening adrenal crisis 63

Adrenal Insufficiency Diagnosis and Treatment

Introduction to Adrenal Insufficiency

• The Endocrine Society recommends hydrocortisone 15-25 mg daily in divided doses for primary or secondary adrenal insufficiency 64
• The American College of Endocrinology suggests that CYP3A4 inducers, such as anticonvulsants, rifampin, and barbiturates, increase cortisol clearance and may require higher replacement doses 64
• Patients with adrenal insufficiency should double or triple their usual dose during illness, fever, or physical stress, and should be prescribed a hydrocortisone 100 mg IM injection kit with self-injection training 64

Medication Considerations

• The Journal of Internal Medicine notes that CYP3A4 inhibitors, such as grapefruit juice and liquorice, decrease cortisol clearance and may require lower doses 64
• Patients taking prednisone, prednisolone, inhaled fluticasone, or other corticosteroids will have suppressed morning cortisol due to iatrogenic secondary adrenal insufficiency, and diagnostic testing should not be attempted until corticosteroids have been discontinued with adequate washout time 64

Treatment and Management

• The Endocrine Society recommends fludrocortisone 50-200 µg daily for primary adrenal insufficiency, and monitoring adequacy by assessing salt cravings, orthostatic blood pressure, peripheral edema, and plasma renin activity 64
• Unrestricted sodium salt intake is essential for patients with primary adrenal insufficiency 64
• Patients with adrenal insufficiency should wear a medical alert bracelet indicating adrenal insufficiency 64

Glucocorticoid Replacement Therapy in Secondary Adrenal Insufficiency

Indication for Lifelong Therapy

• All patients with confirmed secondary adrenal insufficiency require lifelong glucocorticoid replacement therapy. 65

Standard and Alternative Dosing Regimens

• The preferred regimen is hydrocortisone 15–25 mg daily given in two to three divided doses to approximate the normal diurnal cortisol rhythm. 65
• An alternative regimen is cortisone acetate 25–37.5 mg daily in divided doses; this pro‑drug requires hepatic conversion to active hydrocortisone. 65

Monitoring and Dose Adjustment

• Monitoring of glucocorticoid replacement should rely primarily on clinical assessment rather than serum cortisol or ACTH measurements. 65
• Signs of over‑replacement (weight gain, insomnia, peripheral edema) indicate excess glucocorticoid exposure and warrant dose reduction. 65
• Signs of under‑replacement (lethargy/fatigue, nausea or poor appetite, weight loss) suggest insufficient dosing and require dose increase. 65
• Dose fine‑tuning should be guided by patient‑reported daily energy levels, mental concentration, and timing of fatigue, with higher doses in the morning and lower doses later in the day to mimic physiological cortisol secretion. 65
• In patients with suspected malabsorption, a cortisol day‑curve (morning post‑dose peak and pre‑dose trough) can be used to guide dosing adjustments. 65

Drug Interactions Affecting Hydrocortisone Requirements

• CYP3A4‑inducing agents (e.g., phenytoin, carbamazepine, phenobarbital, rifampin, other antituberculosis drugs, barbiturates) increase hydrocortisone clearance and may necessitate higher replacement doses. 65
• CYP3A4‑inhibiting substances (e.g., grapefruit juice, licorice) decrease hydrocortisone clearance and may require dose reduction. 65

Patient Education and Safety Measures

• Every patient should wear a medical alert bracelet or necklace indicating adrenal insufficiency to trigger emergency stress‑dose administration by healthcare providers. 65
• Patients should carry a steroid emergency card at all times to quickly convey their diagnosis and treatment needs. 65

Prevention of Recurrent Adrenal Crises

• Inadequate patient education on stress‑dosing is a frequent contributor to recurrent adrenal crises. 65
• Failure to increase glucocorticoid dose during intercurrent illness, despite prior education, markedly raises the risk of crisis. 65

Glucocorticoid Replacement Regimens for Confirmed Adrenal Insufficiency

Maintenance Glucocorticoid Dosing

• The preferred maintenance regimen for confirmed adrenal insufficiency is hydrocortisone 15–25 mg daily given in divided doses, typically 10 mg at 07:00, 5 mg at 12:00, and 2.5–5 mg at 16:00 h【66】.

Mineralocorticoid Replacement (Primary AI)

• For patients with primary adrenal insufficiency, fludrocortisone 50–200 µg daily is recommended to provide mineralocorticoid replacement and maintain sodium balance and blood pressure【66】.

Patient Emergency Preparedness

• Individuals diagnosed with adrenal insufficiency should receive an emergency injectable hydrocortisone 100 mg intramuscular kit and be trained in self‑administration for use during acute adrenal crises【66】.

Clinical Indicators and Emergency Management of Adrenal Insufficiency

Diagnostic Clinical Signs

• Hyperpigmentation of skin creases, scars, or mucous membranes strongly suggests primary adrenal insufficiency because it reflects markedly elevated ACTH levels. 67
• Orthostatic hypotension is a characteristic sign of mineralocorticoid deficiency and therefore points toward primary adrenal insufficiency. 67
• Lack of hyperpigmentation with normal skin coloration favors secondary adrenal insufficiency, where ACTH production is low or absent. 68

Laboratory Interpretation Caveats

• The absence of hyperkalemia does not exclude primary adrenal insufficiency; hyperkalemia is present in only about 50 % of such cases. 67

Emergency Treatment Protocol for Suspected Acute Adrenal Crisis

• In patients with suspected acute adrenal crisis (e.g., hypotension, shock, altered mental status, severe vomiting), diagnostic procedures must not delay immediate therapy. [67][68]
• The recommended initial emergency therapy is a 100 mg intravenous bolus of hydrocortisone combined with rapid isotonic saline infusion at approximately 1 L per hour. [67][68]
• If feasible, obtain blood samples for cortisol and ACTH before administering steroids, but treatment should proceed without waiting for laboratory results. [67][68]

Diagnostic Approach to Adrenal Insufficiency

Initial Hormonal Assessment

• A morning serum cortisol < 250 nmol/L (≈ 9 µg/dL) together with markedly elevated plasma ACTH (> 300 pg/mL) establishes the diagnosis of primary adrenal insufficiency without further testing. 69
• Markedly elevated ACTH (> 300 pg/mL) with low cortisol confirms primary adrenal insufficiency; conversely, a low or inappropriately normal ACTH with low cortisol points to secondary adrenal insufficiency. 69

Interpretation Thresholds

• In patients with acute illness, a morning cortisol < 400 nmol/L (≈ 14 µg/dL) combined with high ACTH raises strong suspicion for primary adrenal insufficiency. 69
• A morning cortisol > 550 nmol/L (≈ 18–20 µg/dL) effectively rules out adrenal insufficiency. 69

Cosyntropin (Synacthen) Stimulation Test

• Perform the high‑dose cosyntropin test when the morning cortisol result is indeterminate (≈ 5–18 µg/dL) or when clinical suspicion remains high despite borderline values. 69
• Protocol: administer 0.25 mg (250 µg) cosyntropin intravenously or intramuscularly, then measure serum cortisol at baseline and at exactly 30 minutes (and optionally at 60 minutes). [69][70]
• Interpretation: a peak cortisol < 500 nmol/L (≈ 18 µg/dL) at 30 or 60 minutes confirms adrenal insufficiency; a peak > 550 nmol/L (≈ 18–20 µg/dL) excludes the disorder. [69][70]

Etiologic Evaluation for Primary Adrenal Insufficiency

• Testing for 21‑hydroxylase autoantibodies is positive in ~85 % of autoimmune Addison’s disease in Western populations; a positive result obviates the need for further etiologic investigations. [69][70]
• If 21‑hydroxylase antibodies are negative, obtain a contrast‑enhanced CT scan of the adrenal glands to assess for hemorrhage, neoplasm, tuberculosis, or infiltrative disease. [69][70]
• In males with negative autoantibodies, measure very‑long‑chain fatty acids to screen for X‑linked adrenoleukodystrophy. 69

Management of Suspected Acute Adrenal Crisis

• In any patient with unexplained hypotension, collapse, severe vomiting, or altered mental status suggestive of adrenal crisis, initiate immediate therapy with 100 mg IV hydrocortisone and rapid isotonic saline (≈ 1 L/hour). Blood should be drawn for cortisol and ACTH before steroid administration when feasible. [69][70]

Patient Education and Safe Co‑management in Isolated ACTH Deficiency

Emergency Guidance

• Patients with secondary adrenal insufficiency should be instructed to seek immediate medical care if they develop severe vomiting, diarrhea, are unable to take oral medications, or exhibit signs of an impending adrenal crisis such as marked weakness, confusion, or hypotension. 71

Thyroid Hormone Initiation

• In individuals who have both isolated ACTH deficiency and hypothyroidism, glucocorticoid replacement must be started several days before initiating thyroid hormone therapy to avoid precipitating an adrenal crisis. 71

Cortrosyn (Cosyntropin) Reconstitution and Handling Guidelines

Reconstitution Procedure

• Sanitize the vial stopper with 70 % isopropanol before needle puncture to maintain aseptic conditions. 72
• Use sterile technique throughout the preparation, avoiding any direct contact of sterile needles or syringes with non‑sterile surfaces. 72
• Add 1 mL of sterile 0.9 % sodium chloride (preferably preservative‑free) to the lyophilized 0.25 mg Cortrosyn vial, yielding a concentration of 0.25 mg/mL (250 µg/mL). 73
• Mix the vial gently until the powder is completely dissolved; vigorous shaking should be avoided. 73
• Perform a visual inspection after mixing to confirm full dissolution and the absence of particulate matter. 72
• If the solution has been refrigerated, warm it to room temperature before administration. 73

Preparation of Low‑Dose (1 µg) ACTH Stimulation Test

• Withdraw 0.1 mL of the reconstituted 0.25 mg/mL solution (contains 25 µg of cortrosyn). 73
• Add this 0.1 mL to 2.4 mL of sterile 0.9 % sodium chloride, creating a 2.5 mL dilution that contains 10 µg/mL; 0.1 mL of this dilution provides the intended 1 µg dose. 72

Storage of Cortrosyn

• Keep sealed lyophilized vials at room temperature with desiccation when bulk powder is used; FDA‑approved pre‑packaged vials do not require desiccation or freezing. 73
• Refrigerate reconstituted solutions at 4 °C immediately after preparation. 72
• Use the refrigerated solution within 24 hours when reconstituted with preservative‑free sterile saline. 73
• Discard any remaining solution in the vial or syringe after the dose has been administered. 73
• Do not store reconstituted solutions at room temperature for prolonged periods, as this accelerates degradation. 72

Stability and Compatibility Considerations

• Avoid adding preservatives such as phenol to the diluent; preservative‑free sterile saline is the preferred diluent. 73
• The pH of cortrosyn in normal saline is weakly to moderately acidic; buffered solutions should be avoided because they reduce stability. 73

Labeling Requirements

• Clearly label the reconstituted vial with the drug name, concentration, reconstitution date, and expiration time. 72

Management of Primary Adrenal Insufficiency

Glucocorticoid Replacement

• Hydrocortisone 15–25 mg daily in divided doses (e.g., 10 mg on waking, 5 mg at midday, 2.5–5 mg in the late afternoon) is recommended for routine hormone replacement. 74
• Alternative glucocorticoid regimens include cortisone acetate 25–37.5 mg daily or prednisone 4–5 mg daily. 74

Mineralocorticoid Replacement (Primary AI Only)

• Fludrocortisone 50–200 µg once daily, taken on awakening, is advised to replace deficient mineralocorticoid activity. 74
• Treatment adequacy should be assessed by clinical signs (salt cravings, orthostatic hypotension, peripheral edema) and by measuring plasma renin activity. 74

Stress Dosing for Surgery

• For major surgical procedures, administer hydrocortisone 100 mg intramuscularly before anesthesia, followed by 100 mg intramuscularly every 6 hours until the patient can resume oral intake. 74

Evidence level not specified in the source.

Metabolic and Cardiovascular Manifestations of Secondary Adrenal Insufficiency

Metabolic Disturbances

• In secondary adrenal insufficiency, hyperkalemia is typically absent because aldosterone secretion remains normal via the renin‑angiotensin system, distinguishing it from primary adrenal insufficiency. 75

Cardiovascular Manifestations

• Hypotension may be present but is generally less severe than in primary adrenal insufficiency, reflecting the preservation of mineralocorticoid function. 75