Question

what is the difference in free testosterone and total testosterone

Answer 1

Free Testosterone is body avilable active male hormone, rest of testosterone is protein bound so not active form.

Answer 2

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Approximately 98% of the testosterone the body produces is bound to either sex-hormone binding globulin (SHBG), or albumin. This is referred to as “bound testosterone.” The 2% that's left is known as “free testosterone.”