Ata Female Hypogonadism Workup

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name: ata-female-hypogonadism-workup
description: This skill guides the workup of females with oligomenorrhea or amenorrhea to evaluate for central hypogonadism by measuring serum estradiol, FSH, and LH while excluding pregnancy, hyperprolactinemia, hyperandrogenism, and thyroid disease. Use when evaluating a female with menstrual irregularities suggesting hypogonadism (e.g., oligomenorrhea/amenorrhea with low estrogen and inappropriately low or normal gonadotropins).
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# Evaluate oligomenorrhea/amenorrhea for central hypogonadism in females

## STEP 1 — Gather Information
Collect menstrual history (oligomenorrhea/amenorrhea duration and frequency), assess for pregnancy symptoms, galactorrhea, hirsutism, acne, weight change, cold/heat intolerance, and fatigue. Obtain serum estradiol, FSH, LH, prolactin, TSH, and free T4; consider total testosterone or androgens if hyperandrogenism is suspected.

## STEP 2 — Rule In / Rule Out
If pregnancy test is positive, prolactin is elevated, TSH is abnormal, or clinical hyperandrogenism is present, rule out central hypogonadism and evaluate for alternative causes; otherwise, if estradiol is low (< lower limit of normal) and FSH/LH are not elevated (i.e., low or normal), rule in central hypogonadism.

## STEP 3 — Classify or Stratify
Classify as isolated central hypogonadism if no other pituitary hormone deficiencies are evident; otherwise, label as part of multiple pituitary hormone deficiency.

## STEP 4 — Decide
For confirmed central hypogonadism without contraindications, initiate physiologic estrogen/progestin replacement (e.g., transdermal estradiol with cyclic progesterone) after ensuring pregnancy is excluded; monitor symptoms and bone health; evaluate for other pituitary deficits.

## Clinical Guardrails / Mimics / Pitfalls
Do not initiate estrogen replacement without excluding pregnancy; avoid relying on random FSH/LH alone; do not perform GnRH stimulation testing (no diagnostic utility); ensure exclusion of hyperprolactinemia, thyroid disease, and hyperandrogenism before attributing menstrual irregularities to central hypogonadism; consider bone density assessment in long-term hypogonadism.

## Concrete Clinical Example
A 30‑year‑old woman reports 4 months of amenorrhea, no galactorrhea, no hirsutism, normal weight, negative pregnancy test. Labs: estradiol 15 pg/mL (low), FSH 2 mIU/mL, LH 3 mIU/mL (low/normal), prolactin normal, TSH normal, free T4 normal. No other pituitary deficits identified. Diagnosis: central hypogonadism. She is started on transdermal estradiol 100 µg/day with cyclic oral progesterone 200 mg for 12 days monthly.

**Source:** Hormonal Replacement in Hypopituitarism in Adults: An Endocrine Society Clinical Practice Guideline, Endocrine Society, 2016, DOI:10.1210/jc.2016-2118