Adult males typically have between 265 and 923 nanograms per deciliter of testosterone (ng/dL) in their blood, while adult females have far less. Typical levels vary depending on age, sex, and health.

Testosterone levels peak for males during puberty and decline with age in all genders. With low testosterone in males, you can have a decreased sex drive, trouble with erections, and low sperm count.

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A blood test is the best way to see if your testosterone levels are normal. Normal testosterone levels in men are 300–1,000 ng/dL; in women, they are 15–70 ng/dL. Testosterone plays a vital role in ...