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Hormones

Testosterone

Clinical biomarkerSex hormoneBloodnmol/L

A circulating androgen measurement.

What it measures

Total and/or free testosterone depending on assay and context.

Why it matters

Used clinically in evaluation of suspected androgen deficiency or excess.

How to interpret it

Timing, sex, age, binding proteins and symptoms matter substantially.

Important limitations

A single value is not a longevity score; treatment decisions require clinical indications and risk assessment.

Evidence status

Clinical biomarker

Established hormone measurement with defined clinical uses, not a general anti-aging target.

Research & guidance

Original papers, validation studies, reviews and clinical guidance connected to this measurement.

For education and evidence exploration, not diagnosis or individualized medical advice.