What is Testosterone?
your main androgen hormone
Testosterone affects energy, libido, muscle mass, and mood. In men it is made mainly in the testes; in women, smaller amounts come from the ovaries and adrenal glands.
The value should be measured in the morning since testosterone varies through the day. Most is bound to SHBG; the free fraction is biologically active.
Test facts
- Unit
- nmol/L
- Sample
- Serum
- Fasting
- No fasting needed
- Turnaround
- 2 days
What does low Testosterone mean?
Low testosterone in men can produce fatigue, reduced libido, depressive symptoms, and loss of muscle mass. In women, low levels are normal.
What does high Testosterone mean?
High testosterone in women can suggest PCOS or an adrenal disorder. In men, high values are uncommon and can reflect testicular tumour or anabolic steroid use.
Panels that measure Testosterone
- Male Annual
- Testosterone Check
- Female Hormones
- Hormone+
- Perimenopause
- Longevity Full
- Athlete Performance
More markers in the same area
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This is general information about the marker, not an assessment of your values and not medical advice. Last updated: May 2026.