What testosterone level is low enough to need treatment?

Short answer

• Most guidelines (including the Endocrine Society) use a total testosterone threshold of about 300 ng/dL (≈10.4 nmol/L). Treatment is generally considered when a man has consistently low morning total testosterone AND symptoms of testosterone deficiency. A single low value is not enough.

What clinicians actually do (summary)

• Measure testosterone in the morning (before 10 a.m.), ideally fasting.
• If total testosterone is below ~300 ng/dL, repeat the test on a different day to confirm.
• If results are borderline (about 250–350 ng/dL) or if SHBG may be abnormal, clinicians may check free testosterone or calculate bioavailable testosterone and look at LH/FSH to help determine the cause.
• Treatment is considered only when low laboratory values are combined with consistent symptoms (low libido, fatigue, loss of muscle mass/strength, depressed mood, decreased bone density, erectile dysfunction, etc.).
• If the low testosterone is due to obesity, medications, chronic illness, or pituitary disease, treating the underlying cause may be preferred.

Important caveats and risks

• Testosterone therapy has benefits and risks (polycythemia, worsening sleep apnea, skin reactions, possible effects on fertility, need for PSA monitoring in older men, etc.). It should be started only after appropriate evaluation and with follow-up monitoring (hematocrit, PSA, clinical symptoms).
• Men planning to father children should be counseled that standard testosterone replacement often suppresses spermatogenesis.

Testing and evaluation — what your clinician will likely order

• Morning total testosterone (repeat if low).
• If needed: free testosterone or calculated free testosterone, SHBG, LH and FSH, prolactin, basic metabolic panel, lipid profile, CBC (hematocrit), PSA (as appropriate), and bone density if indicated.

Where to get tested and treated (examples)

• Labs: LabCorp or Quest Diagnostics for reliable blood testing.
• Specialty evaluation: see an endocrinologist or urologist. Many primary care doctors can evaluate and manage straightforward cases.
• Telemedicine providers that offer men’s health services (convenient for initial screening but check for thorough evaluation and monitoring): Roman, Hims, Vault Health. Use them cautiously and confirm they do proper labs and follow-up.
• If you pursue treatment, FDA‑approved products you might encounter (different delivery options):
  • Gels: AndroGel, Testim — easy daily dosing, risk of transfer to others.
  • Patches: Androderm — daily patch.
  • Injections: Depo-Testosterone (testosterone cypionate), generic testosterone enanthate — intramuscular injections every 1–3 weeks (or longer‑acting formulations).
  • Long‑acting IM: Aveed (testosterone undecanoate) — infrequent dosing but requires clinic administration and monitoring.
  • Nasal: Natesto — multiple daily nasal doses.
  • Oral (formulation): Jatenzo (oral testosterone undecanoate) — prescription oral option with specific monitoring requirements.

Next steps I recommend

1. If you have symptoms, get a morning total testosterone test (LabCorp or Quest).
2. If low, repeat the test and ask your clinician to check LH/FSH and other relevant labs to determine cause.
3. Discuss risks and benefits and whether referral to an endocrinologist or urologist is appropriate before starting therapy.

If you want, tell me your morning total testosterone result and symptoms (age, major health conditions, fertility plans) and I can help interpret it and suggest next steps.