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Testosterone levels in males and females ; Total testosterone Stage Age range Male Female Values SI units Values SI units ; Infant: Premature (26–28 weeks) 59–125 ng/dL: 2.047–4.337 nmol/L
Free Androgen Index (FAI) is a ratio used to determine abnormal androgen status in humans. The ratio is the total testosterone level divided by the sex hormone binding globulin (SHBG) level, and then multiplying by a constant, usually 100. The concentrations of testosterone and SHBG are normally measured in nanomols per liter. FAI has no unit.
Testosterone, total Refs Endocrine Society: United States: 100–200 pg/mL <50 ng/dL [1] World Professional Association for Transgender Health (WPATH) United States "[T]estosterone levels [...] below the upper limit of the normal female range and estradiol levels within a premenopausal female range but well below supraphysiologic levels."
Testosterone levels peak in the teen years. When men are in their mid-30s, testosterone levels begin to decline. A healthy testosterone level depends on your age, genetics, and lifestyle.
Research on women and testosterone has been limited, but as more is done, experts are seeing that the hormone affects the female sex drive, just as it does the male. It also plays an essential ...
Testosterone levels very with age, according to the Cleveland Clinic, and start to drop around age 30 or 40. Women turn to weight loss drugs in menopause: What to know about the benefits and risks
In particular, research has questioned the validity of commonly administered assays of free testosterone by radioimmunoassay. [16] The free androgen index, essentially a calculation based on total testosterone and sex hormone-binding globulin levels, has been found to be the worst predictor of free testosterone levels and should not be used. [17]
In women with polycystic ovary syndrome (PCOS), a condition of androgen excess, testosterone levels are typically around 50 to 80 ng/dL, with a range of about 30 to 140 ng/dL. [9] [10] [7] Total testosterone levels are about 20-fold and free testosterone levels about 40-fold higher in men than in women on average. [11]