Guideline Recommendations for Symptomatic Non‑Classical Congenital Adrenal Hyperplasia (NCCAH)

Indications for Glucocorticoid Therapy in Adult Women

Glucocorticoid treatment is recommended for adult women with NCCAH who experience clinically important hyperandrogenism (e.g., marked hirsutism, acne, androgenic alopecia). 1
Glucocorticoid therapy should be initiated in adult women with NCCAH who have infertility or recurrent miscarriage. 1
Glucocorticoid therapy is indicated when menstrual irregularities cause significant symptoms in adult women with NCCAH. 1

Dexamethasone 0.25 mg once daily effectively reduces acne and irregular menstruation within approximately 3 months and improves hirsutism over a longer period (≈30 months). This regimen is the most frequently studied in the literature for symptomatic NCCAH. 1

Routine daily glucocorticoid substitution is not recommended for asymptomatic adult males with NCCAH. 1
Testicular adrenal rest tumors are uncommon in NCCAH, distinguishing it from classic CAH. 1
Prophylactic glucocorticoid use in adult males with NCCAH is not warranted. 1

Targeting complete normalization of 17‑hydroxyprogesterone levels should be avoided, as it leads to supraphysiologic glucocorticoid dosing and worsens metabolic outcomes. 2
Clinicians should watch for signs of iatrogenic Cushing’s syndrome (e.g., weight gain, elevated blood pressure, impaired glucose tolerance). 1
In adult males, testosterone alone is an unreliable marker of disease control; the androstenedione‑to‑testosterone ratio provides a more accurate assessment. 2
Regular assessment of hyperandrogenic symptoms (hirsutism, acne, alopecia) is essential for ongoing management. 1

NCCAH patients do not require routine stress‑dose glucocorticoids because there is no evidence of clinically significant cortisol deficiency or risk of adrenal crisis. 1

According to Endocrine Society guidance, 68 % of pregnancies in women with NCCAH occurred before the condition was diagnosed, indicating that glucocorticoid therapy is not universally required for fertility preservation. 1

NCCAH fundamentally differs from classic CAH: it does not cause adrenal insufficiency, salt‑wasting, or marked cortisol deficiency. Management should therefore focus on controlling symptomatic androgen excess rather than hormone replacement. 1