The percentage of testosterone that is free and active.
Free testosterone percent shows what share of your total testosterone is circulating unbound and available to your tissues, expressed as a percentage. It pairs with the directly measured free testosterone value.
Only a small slice of total testosterone is free, usually a couple of percent, with the rest bound to SHBG and albumin. This percentage puts the free fraction in context of the total.
Looking at free testosterone as a percentage helps show how the binding proteins are shaping availability. When SHBG is high, the percentage tends to fall, and when SHBG is low it tends to rise.
It is a supporting view rather than a standalone diagnosis, used together with total and free testosterone to understand androgen status.
Aniva reads your result against research-backed ranges, not just the lab's wide normal. The reference shown below is specific to this biomarker.
Typical adult male guidance, assay dependent:
| Result | Range |
|---|---|
| Free testosterone (% of total, men) | about 1.5 to 4.2 % |
Values depend on the method and are interpreted with total and free testosterone. Read against your lab's reference interval.
The percentage depends on accurate free and total testosterone results and on the assay used. Morning timing matters, and SHBG-altering states such as obesity, thyroid disease, or the contraceptive pill shift the value. Biotin can interfere with some assays.
Read alongside total testosterone, free testosterone, and SHBG.
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