Investigation and Management of Primary Adrenal Insufficiency in Young Females

Initial Etiologic Investigation

• The European Society of Endocrinology recommends measuring 21-hydroxylase autoantibodies (21OH-Ab) as the first diagnostic test to determine etiology in young females with primary adrenal insufficiency, using a validated method such as the commercial kit from FIRS Laboratories, with autoimmune adrenal insufficiency confirmed if 21OH-Ab is positive, accounting for approximately 85% of PAI cases in Western Europe 1
• Consider Autoimmune Polyendocrine Syndrome type 1 (APS-1) in young patients, especially if other components are present, such as hypoparathyroidism, candidiasis, dental enamel dysplasia, keratitis, autoimmune hepatitis, malabsorption, or premature ovarian insufficiency 2

For 21OH-Ab Positive Patients

• If APS-1 is suspected, extend evaluation to include measurement of interferon omega or IL-22 autoantibodies and mutational analysis of AIRE gene if possible, as recommended by the European Society of Endocrinology 2
• Screen for other autoimmune conditions commonly associated with PAI, including thyroid function tests and thyroid autoantibodies, fasting glucose or HbA1c, and vitamin B12 levels, as suggested by the American Thyroid Association and the American Diabetes Association 3

For 21OH-Ab Negative Patients

• Perform CT scan of adrenal glands to identify tumors, masses, calcifications, adrenal hemorrhage, or bilateral adrenal metastasis, as recommended by the Radiological Society of North America 1
• Consider infectious causes, including tuberculosis testing, HIV testing, and fungal infection screening, as suggested by the Infectious Diseases Society of America 1
• Evaluate for genetic causes, such as adrenoleukodystrophy, congenital adrenal hyperplasia, and hypogonadotropic hypogonadism, as recommended by the American College of Medical Genetics and Genomics 1

Management Considerations

• Once etiology is determined, initiate lifelong steroid replacement with both glucocorticoids and mineralocorticoids, as recommended by the Endocrine Society 1
• Educate the patient about increasing steroid doses during illness or injury, providing training in intramuscular administration of hydrocortisone, and recommending wearing a Medic Alert Bracelet and carrying a steroid card, as suggested by the American College of Emergency Physicians 1

Common Pitfalls to Avoid

• Never delay treatment with intravenous hydrocortisone and physiologic saline if acute adrenal crisis is suspected, as recommended by the American College of Emergency Physicians 4
• Avoid missing APS-1 in young patients by carefully evaluating for associated conditions, as suggested by the European Society of Endocrinology 2