Verbatim response from ChatGPT
Short answer
- There isn’t a single “magic” number, but most endocrinology guidelines say: treatment may be appropriate for men who have consistent symptoms of low testosterone plus a morning total testosterone <300 ng/dL (about 10.4 nmol/L) on at least two separate occasions.
Details and practical steps
- Timing and repetition matter: measure total testosterone in the morning (before ~10 AM) on two different days when you’re otherwise well. Acute illness, some medications, and recent exercise can lower levels transiently.
- Common thresholds used in practice:
- Endocrine Society: treat symptomatic men with total testosterone <300 ng/dL (≈10.4 nmol/L).
- Some labs/guidelines use slightly different cutoffs (e.g., 230–264 ng/dL or 8–9.2 nmol/L); NICE in the UK uses 8 nmol/L (~231 ng/dL) together with symptoms.
- Borderline results (230–400 ng/dL): evaluate symptoms carefully and consider repeat tests, measure SHBG and calculated free testosterone (useful if SHBG is abnormal), and check LH/FSH to distinguish primary vs secondary hypogonadism.
- Very low levels (<200 ng/dL) with symptoms are more clearly abnormal and usually prompt evaluation/treatment.
What else should be checked before treating
- Basic workup: CBC, PSA (if age/risks appropriate), LH, FSH, prolactin (if low T with low/normal LH/FSH), and SHBG or calculated free testosterone if indicated.
- Consider causes: obesity, diabetes, opioids, steroids, pituitary disease, sleep apnea, alcohol, chronic illness.
- Fertility: exogenous testosterone suppresses sperm production. If you want fertility, discuss alternatives (clomiphene citrate, hCG) with a specialist.
Contraindications and monitoring
- Do not start testosterone if untreated prostate or breast cancer is suspected. Other cautions: uncontrolled heart failure, untreated severe sleep apnea, hematocrit >50%.
- If treated, monitor testosterone level, hematocrit, and PSA at baseline and periodically (e.g., at 3 months, then every 6–12 months depending on findings).
Where to get testing and care (specific services/brands)
- Labs: Quest Diagnostics or LabCorp — widely available, accepted by most clinicians, and can do total and free testosterone testing.
- Primary care or specialists: see your PCP, an endocrinologist, or a urologist experienced in male hormone care for interpretation and safe treatment decisions.
- Telemedicine clinics that offer specialized men’s health/testing and coordinated lab work (if you prefer remote care): Vault Health, Roman, Hims — useful for access and convenience, but make sure they provide proper baseline labs and monitoring and refer to specialists when needed.
- If treatment is prescribed, commonly used testosterone preparations include: intramuscular testosterone cypionate or enanthate (generic or Depo-Testosterone), long‑acting intramuscular testosterone undecanoate (Aveed), and topical gels (AndroGel, Testim, Axiron). Choice depends on dosing preference, cost/insurance, and side-effect profile. Discuss options with your clinician.
If you want a next step
- If you have symptoms (low energy, low libido, erectile dysfunction, low muscle mass, mood changes), arrange morning total testosterone testing twice and bring the results to your clinician for interpretation. If you want, tell me your age, symptoms, and any current medications/medical history and I can help interpret a result or suggest what to ask your doctor.