Testosterone (Free)
Free testosterone measures the small fraction of testosterone not bound to proteins in the blood and is the biologically active form. It can be a more sensitive indicator of testosterone-related cond…
Category: Hormones
Also known as: free testosterone, testosterone free, ft, free testo, Testost Free, Testosterone.unconjugated
Reference range: 50–210 pg/mL (Source: ABIM)
Standard unit: pg/mL
High values may indicate
High free testosterone may indicate polycystic ovary syndrome (PCOS) in women, anabolic steroid use, adrenal or testicular tumors, or congenital adrenal hyperplasia.
Low values may indicate
Low free testosterone may indicate hypogonadism, aging-related decline, pituitary disorders, chronic illness, or elevated SHBG levels, and may cause fatigue, low libido, and muscle loss.
Frequently asked questions
- What is a normal Testosterone (Free) level?
- A typical reference range for Testosterone (Free) is 50–210 pg/mL (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is Testosterone (Free) measured in?
- Testosterone (Free) is most commonly reported in pg/mL. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do Testosterone (Free) reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track Testosterone (Free) over time?
- Yes. Upload results from any lab and BloodId charts your Testosterone (Free) over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: MedlinePlus, U.S. National Library of Medicine
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