Hormones & Performance·Best seller
Amenorrhea Profile
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Hormones & Performance·Best seller
Free Testosterone
Free testosterone is the active, unbound form of testosterone—the portion not tied up by SHBG or albumin. This is what actually interacts with androgen receptors and drives results: libido, muscle retention, motivation, energy, and recovery. You can have “normal” total T but feel off if your free T is low. It’s one of the most important markers for androgen status and performance.
Immunoassay or LC/MS? How testosterone tests differ, and why the 1,500 cap matters
- Unit
- ng/dL
- Health impacts
- Mood · Energy · Libido
In your dashboard
Your trend, against your optimal range.
Male
Example data · how your trend would appear once you test
Female
Example data · how your trend would appear once you test
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Pick the lab that fits your day.
QuestTest code: 18944$29.99
LabCorpTest code: 144980$60
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