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Testosterone is an important hormone. It helps men develop during puberty, and as they age, it plays a critical role in helping control fat levels, cholesterol, and glucose levels.
Instead, the blood test looks for your total testosterone levels, which counts free T as well as that bound to the proteins sex hormone-binding globulin (SHBG) and albumin.
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
To be sure, get a fasting testosterone test at your doctors, preferably in the morning, when the hormone’s levels peak. Repeat the test at least once, with the second a day or more after the first.
However, free testosterone is difficult and expensive to measure (it requires a time-consuming dialysis step), and many laboratories do not offer this service. The free androgen index is intended to give a guide to the free testosterone level, but it is not very accurate (especially in males — see endocrine society commentary below).
Testosterone is the primary male sex hormone and androgen in males. [3] In humans, testosterone plays a key role in the development of male reproductive tissues such as testicles and prostate, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.
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