Free Testosterone (%) details
What Free Testosterone (%) shows
Most testosterone in your blood is bound to proteins, mainly sex hormone-binding globulin (SHBG) and albumin, and only a small percentage circulates free and readily available to tissues. This value is the free fraction, measured directly by ultrafiltration and expressed as a percentage of total testosterone. Your absolute free testosterone is then calculated from this percentage and your total testosterone result. The percentage mainly reflects how much binding protein is present: a higher percentage can point to lower SHBG, and a lower percentage to higher SHBG, as seen with factors such as age, weight, thyroid status or certain medicines. It is interpreted alongside total and absolute free testosterone.
Tests that include Free Testosterone (%)
This panel measures both free and total testosterone levels in the blood. It can help assess testicular function in men and investigate symptoms such as hirsutism, irregular periods, or signs of masculinization in women.
- Free Testosterone The small portion of your testosterone that's unbound and biologically active, considered a more accurate reflection of usable hormone than total testosterone.
- Testosterone The primary male sex hormone, also present in women in smaller amounts. Evaluated for low testosterone symptoms, fertility, and reproductive hormone imbalances.
- Free Testosterone (%) The percentage of your total testosterone that circulates unbound, measured by ultrafiltration and used to work out your free testosterone level.
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