What testosterone level is low enough to need treatment?

Short answer

• There’s no single number that automatically “needs” treatment. Most guidelines recommend treating only men who have both (A) clear symptoms of testosterone deficiency and (B) consistently low serum total testosterone — usually <300 ng/dL (10.4 nmol/L) on at least two morning tests.

Why not treat on one low lab alone

• Testosterone levels vary with time of day, illness, medications, obesity and lab methods. A single low value isn’t enough; diagnosis requires consistent low measurements plus compatible symptoms (low libido, erectile problems, fatigue, loss of muscle mass, depression, reduced spontaneous erections, etc.).

Numbers and units to know

• Common threshold used by urology/endocrine guidelines: total testosterone <300 ng/dL (≈10.4 nmol/L).
• If total testosterone is borderline (roughly 230–350 ng/dL) or if you have conditions that affect SHBG (obesity, diabetes, liver disease), clinicians will often measure or calculate free testosterone — compare that to the lab’s reference range (free-T assays and reference ranges vary by lab and method).

How testing should be done

• Draw blood in the morning (typically before 10 a.m.), fasting if possible.
• Repeat the test on a different day to confirm a low value.
• Stop exogenous testosterone or certain interfering medications before testing if possible (discuss with your clinician).

Other tests often ordered

• LH and FSH (to distinguish primary vs secondary hypogonadism)
• Prolactin (if secondary hypogonadism suspected)
• SHBG (when free T is needed)
• CBC (baseline hematocrit)
• PSA (in men ≥40 or with prostate symptoms)
• Metabolic panel, fasting glucose or lipids as clinically indicated

When treatment is considered

• Symptomatic men with confirmed low total testosterone on ≥2 morning tests.
• Consider patient age, comorbidities, fertility desire (testosterone therapy suppresses sperm production), and risks (erythrocytosis, potential prostate issues, cardiovascular concerns).

If fertility is a concern

• Standard testosterone therapy can suppress sperm production. Alternatives to discuss with a specialist include clomiphene citrate, hCG, or referral to a reproductive/urology specialist.

Monitoring if you start therapy

• Check testosterone level after ~3 months to confirm adequate dosing, CBC/hematocrit at 3–6 months then periodically, PSA at baseline and per guideline intervals, and symptom/side-effect review.

Practical next steps

• If you suspect low T: get morning total testosterone measured twice and see a primary care physician, urologist or endocrinologist for interpretation and next steps.

Where to get testing or care (examples)

• Lab testing: LabCorp or Quest Diagnostics — widely available, accepted by clinicians, good for morning testosterone draws and follow-up testing.
• Telemedicine/private men’s health services: Roman or Hims — convenient for evaluation and treatment for some men, but important to ensure they perform appropriate baseline tests and monitoring.
• If you want specialist care: see a local endocrinologist or urologist (search your region or ask your PCP for a referral).

If you’d like, tell me:

• your age, symptoms, and any lab results you already have (with units and time of day drawn), and I can help interpret them and suggest next tests or questions to ask your clinician.