Initial Evaluation of Hypertension in Young Adults

Basic Laboratory Testing

The American College of Cardiology recommends ordering a comprehensive metabolic panel, complete blood count, lipid profile, thyroid-stimulating hormone, urinalysis with urine albumin-to-creatinine ratio, and a 12-lead electrocardiogram for an 18-year-old male with elevated blood pressure 1, 2, 3
Fasting blood glucose testing is recommended to identify diabetes mellitus, which significantly increases cardiovascular risk and lowers treatment thresholds 1, 2, 4
Complete blood count is recommended to detect anemia or other hematologic abnormalities 1, 2
Lipid profile is recommended for cardiovascular risk stratification 1, 2, 4
Serum creatinine with estimated glomerular filtration rate (eGFR) is recommended to assess kidney function and detect chronic kidney disease 1, 2, 3, 5
Serum sodium, potassium, and calcium testing is recommended to detect electrolyte abnormalities that may suggest secondary causes like primary aldosteronism 1, 2, 3
Thyroid-stimulating hormone testing is recommended to easily detect hypothyroidism and hyperthyroidism, both remediable causes of hypertension 1, 2, 3

Urinalysis is recommended to screen for kidney disease 1, 2, 3
Urinary albumin-to-creatinine ratio is recommended rather than urine dipstick, as it is more sensitive for detecting early kidney damage and cardiovascular risk 5, 4

A 12-lead electrocardiogram is recommended to detect left ventricular hypertrophy, arrhythmias (including atrial fibrillation), and ischemic heart disease 1, 2, 3, 4

The American College of Cardiology recommends measuring thigh blood pressure in adults ≤30 years of age with elevated brachial blood pressure; if the thigh measurement is lower than arm pressures, coarctation of the aorta should be considered 2
Young patients with hypertension warrant heightened suspicion for secondary causes, particularly given the absence of typical risk factors like obesity, family history, or gradual onset 1, 6

Clinical clues suggesting secondary hypertension include age of onset <30 years, severe or resistant hypertension, absence of family history of hypertension, and abrupt onset rather than gradual increase 1, 2, 6
The European Society of Cardiology recommends measuring renin and aldosterone in all adults with confirmed hypertension, representing a significant change from traditional approaches 6

An echocardiogram is recommended if ECG shows abnormalities, cardiac symptoms are present, or detection of left ventricular hypertrophy would influence treatment decisions 3, 4
Uric acid testing is recommended as part of the initial evaluation 1, 2, 3

The American Journal of Kidney Diseases recommends using urine albumin-to-creatinine ratio instead of urine dipstick alone for albuminuria screening, as it is more sensitive for detecting early kidney damage 5
The American College of Cardiology recommends not skipping the ECG, as it is essential for detecting left ventricular hypertrophy and arrhythmias even in young patients 1, 2, 3
The American College of Cardiology recommends not overlooking secondary causes in young patients; the prevalence is higher than in older adults with gradual-onset hypertension 6
The American College of Cardiology recommends confirming hypertension with repeated measurements before extensive workup, but not delaying basic laboratory testing once hypertension is confirmed 1, 2

The European Society of Hypertension and European Society of Cardiology recommend including hemoglobin and/or hematocrit as part of routine testing for all hypertensive patients 7, 8
The European Society of Cardiology recommends measuring serum creatinine, eGFR, and urine ACR in all patients with hypertension, with ECG as standard testing 9, 10
The American College of Cardiology is not the source of this fact, however, the 2013 ESH/ESC Guidelines explicitly list "Haemoglobin and/or haematocrit" as a routine test for all hypertensive patients 7, 8

For women with chronic hypertension in pregnancy, a full blood count is explicitly recommended at first diagnosis to establish baseline values, which becomes critical for detecting superimposed preeclampsia 11

The complete routine laboratory panel for hypertension typically includes lipid profile (total cholesterol, LDL, HDL, triglycerides) 7

Measure serum creatinine and calculate estimated glomerular filtration rate (eGFR) to establish baseline kidney function and identify chronic kidney disease. 12, 13, 14

Check serum sodium, potassium, and calcium to uncover electrolyte disturbances that may point to secondary causes such as primary aldosteronism. 12, 14, 15
Obtain a fasting blood glucose level to screen for diabetes mellitus, a major cardiovascular risk enhancer that influences antihypertensive treatment thresholds. 12, 16, 14, 15

Perform a complete blood count (including hemoglobin and hematocrit) to detect anemia or other hematologic abnormalities that can affect blood pressure control. 12, 13, 15

Order a lipid profile (total cholesterol, LDL‑C, HDL‑C, triglycerides) to quantify a patient’s atherosclerotic risk and guide therapy intensity. 12, 13, 14, 15
Measure thyroid‑stimulating hormone to identify hypo‑ or hyper‑thyroidism, both reversible contributors to hypertension. 12, 14, 15

Use urine albumin‑to‑creatinine ratio (UACR) rather than dipstick alone because it is more sensitive for early kidney injury and associated cardiovascular risk. 12, 13
A UACR result in the moderately elevated range signals increased cardiovascular risk and warrants closer monitoring. 12
Detecting albuminuria can influence drug selection; agents that block the renin‑angiotensin system (ACE inhibitors or ARBs) provide added benefit in patients with elevated albumin excretion. 12, 16

Obtain a 12‑lead electrocardiogram to identify left ventricular hypertrophy, arrhythmias (including atrial fibrillation), and underlying ischemic heart disease. 12, 13, 14, 15

Consider transthoracic echocardiography when the ECG shows abnormalities, cardiac murmurs are present, symptoms suggest structural disease, or confirmation of left ventricular hypertrophy would alter management. 12, 13
Evaluate serum uric acid in the initial work‑up, especially in patients with resistant hypertension. 12, 15
If fasting glucose is elevated, obtain a hemoglobin A1c to confirm or rule out diabetes mellitus. 13, 14, 15

In women of childbearing potential, baseline pregnancy testing should be considered before starting or modifying amlodipine‑based regimens. 16

Do not omit the baseline ECG, even in younger adults, because it is essential for detecting left ventricular hypertrophy and arrhythmias. 13
Do not rely solely on urine dipstick for albuminuria screening; always order a quantitative UACR. 12
Actively look for clues of secondary hypertension during the initial evaluation—hypokalemia may indicate primary aldosteronism, and an elevated creatinine level may suggest underlying renal disease. 12, 17