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
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.