What testosterone level is low enough to need treatment?

Short answer

• Most experts recommend treatment only when you have consistent symptoms of low testosterone AND a reliably low morning total testosterone level. The commonly used laboratory cutoff is total testosterone <300 ng/dL (≈10.4 nmol/L) on at least two separate morning tests.

Why that threshold

• The Endocrine Society and many other guidelines use ~300 ng/dL as the lower limit of the normal adult male reference range and recommend confirming a low value on a repeat early-morning sample before starting therapy.
• Lab reference ranges vary, so “low enough to treat” is a combination of a numeric low result plus relevant symptoms.

What “symptoms” mean (examples)

• Low sex drive, erectile dysfunction
• Fatigue, low energy, depressed mood
• Loss of muscle mass or strength, increased body fat
• Reduced bone density or unexplained anemia

Recommended evaluation before treatment

• Measure total testosterone in a fasting blood draw taken early morning (typically 7–10 AM). If low, repeat on a separate morning.
• If total testosterone is borderline low, consider measuring free testosterone or SHBG.
• Check LH and FSH (to distinguish primary from secondary hypogonadism) and prolactin if appropriate.
• Baseline tests before starting therapy: CBC (for hematocrit), PSA (if age/risks indicate), and assess for contraindications (active prostate cancer, untreated severe heart failure).
• If secondary hypogonadism is suspected (low T with low/normal LH), evaluate pituitary (endocrine review, MRI when indicated).

Risks and monitoring if you start testosterone

• Benefits: can improve libido, energy, muscle mass, bone density in properly selected men.
• Risks: erythrocytosis (monitor hematocrit), possible effects on fertility, potential prostate issues, and uncertain effects on cardiovascular risk.
• Monitoring typically includes hematocrit, testosterone levels, and PSA at regular intervals (your clinician will set timing).

When to see a specialist

• If tests confirm low testosterone and LH/FSH are abnormal, or if you have complex health problems, see an endocrinologist or urologist for further workup and treatment planning.

Where to get care

• Primary care providers can usually do the initial testing and management. For specialized evaluation or complex cases, endocrinology or urology clinics (for example, Mayo Clinic Endocrinology or Cleveland Clinic Endocrinology) are good options because of their expertise.
• If you prefer telehealth for convenience, services such as Roman or Hims offer evaluation and monitoring for testosterone therapy; they’re convenient but make sure they provide appropriate lab testing and follow-up monitoring.

Bottom line

• Don’t base treatment solely on one lab value. Treatment is generally recommended when you have consistent symptoms plus a confirmed total testosterone below about 300 ng/dL (on two morning tests). Discuss results and options with your primary care physician or an endocrinologist to review cause, risks, and appropriate monitoring.

If you want, tell me your lab result(s), time of day the blood was drawn, and symptoms — I can help interpret what to discuss with your clinician.