Hormones
Free Testosterone
LOINC 2991-8 · pmol/L
What it is
Free testosterone is the small portion of testosterone not bound to proteins — the part readily available to your tissues.
Why it matters
It can give a clearer picture of active testosterone than the total, especially when binding proteins are altered.
What high values can mean
A higher value can relate to certain hormonal conditions and may cause symptoms such as acne or, in women, excess hair growth.
What low values can mean
A lower value can cause low energy, reduced libido or mood changes and is more common with age.
How to improve it
Healthy weight, strength training, good sleep and managing chronic conditions support healthy testosterone.
Food & lifestyle
Adequate sleep, resistance exercise and a balanced diet support hormone balance; supplements are not a substitute for evaluation.
Preparing for the test
Best drawn in the morning when testosterone peaks; follow your lab's instructions.
When to talk to a doctor
Discuss abnormal free testosterone with a doctor, interpreted with total testosterone and SHBG.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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