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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.