Hormonal Evaluation in Secondary Amenorrhea

Introduction to Diagnostic Approach

The American Academy of Pediatrics recommends considering hormonal contraceptives' impact on the hypothalamic-pituitary-ovarian axis when interpreting sex hormone levels, as they suppress this axis, making interpretation challenging while on treatment 1, 2
The Centers for Disease Control and Prevention suggests that amenorrhea on birth control is expected but may suggest underlying pathology if accompanied by symptoms like hot flashes, fatigue, and brain fog, indicating possible ovarian insufficiency or another endocrine disorder 1

The Endocrine Society recommends measuring prolactin, as hyperprolactinemia accounts for 20% of secondary amenorrhea cases and can cause symptoms like hot flashes, fatigue, and brain fog, with a threshold for abnormal being >20 μg/L 3, 4
The American College of Obstetricians and Gynecologists suggests ideally measuring FSH and LH as an average of three samples taken 20 minutes apart, with FSH >40 mIU/mL indicating primary ovarian insufficiency 3, 5
The Society for Reproductive Endocrinology and Infertility recommends measuring estradiol, as low levels suggest ovarian insufficiency, helping distinguish true premature ovarian failure from contraceptive-induced suppression 3, 5

The American Association of Clinical Endocrinologists recommends considering DHEA-S and total/free testosterone, as elevated androgens suggest PCOS or adrenal pathology, with DHEA-S being primarily adrenal in origin 3, 4

The National Institute of Child Health and Human Development suggests that the most accurate approach is to have the patient discontinue hormonal contraception for 6-8 weeks before testing, then repeat the hormonal panel, but if this is not possible, to proceed with testing while interpreting results cautiously due to the suppressive effect of exogenous hormones on FSH, LH, and estradiol 1, 2

The American College of Physicians advises against assuming amenorrhea on birth control is benign without investigating systemic symptoms, as hot flashes at age 33 are particularly concerning for premature ovarian insufficiency 5
The Society for Endocrinology recommends recognizing that hyperprolactinemia itself causes anovulation by suppressing kisspeptin and gonadotropin secretion, making it difficult to distinguish from PCOS initially 3, 4

The World Health Organization recommends using N91.1 (Secondary amenorrhea) as the primary diagnosis, with additional codes for symptoms such as R61 (Generalized hyperhidrosis) for hot flashes 3, R53.83 (Fatigue) 2, R41.840 (Attention and concentration deficit) for brain fog 2, R45.4 (Irritability and anger) 2, and E66.9 (Obesity, unspecified) or R63.5 (Abnormal weight gain) if applicable 2
The American Medical Association suggests using E28.310 (Symptomatic premature menopause) if FSH >40 mIU/mL 5, E22.1 (Hyperprolactinemia) if prolactin is elevated 4