Testosterone Blood Test — Complete Question Guide
Content last reviewed 2026-09-12 · Educational information — not medical advice
Quick answer
Morning total testosterone quantifies the hormone driving male sexual development, muscle/bone maintenance, and libido — plus smaller-but-real female physiology. Draw BEFORE 10am; confirm lows twice before treating. $50–110, results 2–3 days.
What does a testosterone test measure?
Total testosterone sums hormone bound to SHBG/albumin plus the tiny free-active fraction. Free-T calculations (needing SHBG) clarify confusing totals. Women run ~10× lower concentrations requiring sensitive assays.
Symptoms that prompt testing
Men: low libido, erectile changes, lost morning erections, fatigue, depressed mood, muscle-loss/fat-gain shifts, gynecomastia. Women: cycle irregularity, hirsutism, acne (excess direction); or hypoandrogen symptoms in menopause contexts.
Why does timing matter SO much?
Circadian rhythm peaks testosterone early morning, declining 20–30% by afternoon. Afternoon draws mislabel millions of normal men as deficient. THE rule: morning draw, then CONFIRM with a second morning draw before any diagnosis or treatment decision.
What causes low testosterone?
Obesity/aromatization, aging (~1%/year drift), opioid therapy (powerful suppression), sleep apnea, pituitary problems (check LH/FSH — secondary patterns need MRI territory thinking), steroid-cycle recovery, chronic illness. Cause determines treatment pathway entirely.
Cost, preparation, results meaning?
$50–110 total-T; free-T/SHBG add modestly. Draw 7–10am fasting-optional. Men 300–1000 ng/dL is the conventional span — but SYMPTOM CORRELATION, not numbers alone, justify intervention, and fertility-preservation conversations MUST precede therapy start.
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Frequently asked questions
Can TRT cause infertility?
Reliably yes — exogenous testosterone shuts sperm production down. Banking sperm or hCG-based strategies must happen BEFORE starting. Non-negotiable sequencing.
Do women need testosterone testing?
PCOS workups use it centrally; menopause-context androgen panels appear selectively. Female ranges sit far lower — assay sensitivity matters.