What testosterone level is low enough to need treatment?

Short answer

• In adult men, most guidelines use a total testosterone cut-off of about 300 ng/dL (≈10.4 nmol/L) as the threshold to consider replacement when symptoms are present.
• Levels <200 ng/dL are more clearly abnormal and likely to cause symptoms; 200–300 ng/dL is a borderline zone where symptoms and further testing determine treatment.
• Treatment decisions are not based on a number alone — symptoms, repeat morning measurements, free/bioavailable testosterone, and other labs all matter.

Details and what to do next

1. Typical reference points

   • Normal adult male total testosterone: roughly 300–1,000 ng/dL (10–35 nmol/L) (lab ranges vary).
   • Common clinical thresholds:
     • <200 ng/dL (<6.9 nmol/L): usually considered definitively low (hypogonadism).
     • ~200–300 ng/dL (6.9–10.4 nmol/L): borderline — interpret with symptoms and further testing.
     • ≥300 ng/dL: generally not treated for “low T” unless there are unusual circumstances and specialist input.

2. Important testing rules

   • Measure total testosterone in the morning (ideally 7–10 AM), when levels are highest.
   • Repeat a second morning total testosterone before diagnosing low T.
   • If SHBG is abnormal (obesity, aging, thyroid disease, liver disease) or results are borderline, measure or calculate free/bioavailable testosterone.
   • Check LH/FSH to distinguish primary (testicular) vs secondary (pituitary/hypothalamic) causes; consider prolactin, basic metabolic panel, and others as guided by the clinician.

3. Symptoms that matter

   • Low libido, erectile dysfunction, decreased energy, loss of muscle mass/strength, increased body fat, depressed mood, decreased bone density, anemia. Treatment is considered only when typical symptoms are present plus low labs.

4. Safety, contraindications, and monitoring

   • Contraindications: untreated prostate or breast cancer; caution with high baseline PSA, uncontrolled heart failure, or hematocrit >50%.
   • TRT can suppress sperm production — avoid if you want fertility (see a fertility specialist).
   • Monitoring after starting TRT: testosterone level, hematocrit (risk of erythrocytosis), PSA (in older men), symptoms, and sometimes liver function depending on formulation.

5. Who to see

   • Primary care doctor, endocrinologist, or urologist for evaluation and diagnosis. If fertility is a concern, see a reproductive/urology specialist.

Practical next steps

• If you suspect low T: get a morning total testosterone test (Labcorp or Quest Diagnostics commonly used), repeat it on another morning, and ask your clinician to check LH/FSH and SHBG or free testosterone if needed.
• Don’t start testosterone without medical supervision.

Treatment options (common products)

• Topical gels: AndroGel, Testim, Axiron — convenient daily application, rapid normalization of levels, but risk of skin-to-skin transfer to others.
• Patches: Androderm — steady delivery, nightly patch, potential for local skin irritation.
• Intramuscular injections: Testosterone cypionate (Depo-Testosterone) — widely used, lower cost; testosterone undecanoate (Aveed, long-acting) — less frequent dosing but requires special administration and monitoring.
• Nasal: Natesto — shorter acting, fewer concerns about transfer to partners.
• Buccal: Striant — less commonly used; buccal delivery.

Telemedicine / men’s health services that provide testing + monitored TRT (if appropriate)

• Roman (Ro) — convenient telemedicine model, lab ordering and medication options; good for people who want a streamlined experience but still need in-person monitoring for certain labs.
• Hims — similar to Roman; offers online evaluation, lab testing, and prescription management.
• Vault Health — focuses on men’s health and fertility-preserving options alongside TRT monitoring.

(If you prefer in-person specialty care, ask for an endocrinology or urology referral at your local hospital/clinic.)

Final note Guidelines differ slightly and individual factors matter. If you want, tell me your age, symptoms, and any recent testosterone result(s) (with units and time of day) and I can help interpret them and suggest next steps.