Ata Male Hypogonadism Timing

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name: ata-male-hypogonadism-timing
description: Recommends performing hormonal testing for central hypogonadism in males in the absence of acute/subacute illness, before 10 AM after an overnight fast, combined with serum prolactin measurement. Use when scheduling hormonal tests for male hypogonadism; triggers include preparing to order hypogonadism labs in male patients.
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# Time hormonal testing for central hypogonadism in males

## STEP 1 — Gather Information
Assess for acute/subacute illness, confirm overnight fast, and plan blood draw before 10 AM; order serum testosterone, FSH, LH, and prolactin.

## STEP 2 — Rule In / Rule Out
Is the patient acutely or subacutely ill?  
- Yes → Defer testing until illness resolves.  
- No → Proceed to timing assessment.

## STEP 3 — Classify or Stratify
Is the blood draw scheduled before 10 AM after an overnight fast?  
- Yes → Proceed to testing.  
- No → Reschedule draw to meet timing criteria.

## STEP 4 — Decide
Obtain serum testosterone, FSH, LH, and prolactin; interpret low/normal testosterone with low/normal gonadotropins as central hypogonadism.

## Clinical Guardrails / Mimics / Pitfalls
Do not test during acute illness, random timing, or non-fasting states; always include prolactin to rule out hyperprolactinemia; avoid relying on random cortisol or dynamic GnRH tests for this indication.

## Concrete Clinical Example
A 48‑year‑old man presents with decreased libido and fatigue, no recent illness, fasting, labs drawn at 09:00 show total testosterone 220 ng/dL (low), FSH 2.1 IU/L (low‑normal), LH 3.0 IU/L (low‑normal), prolactin 12 ng/mL (normal); diagnosis of central hypogonadism is made and testosterone replacement is considered.

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