When it comes to diagnosing deficiency of male hormones, measuring free testosterone together with total testosterone may provide more accurate picture than measuring total-testosterone levels alone. Currently, total-testosterone levels are used as a measure of testosterone deficiency or hypogonadism. However, only free testosterone, unbound by sex-hormone–binding globulin (SHBG), can enter and activate androgen receptors in cells, resulting in testosterone-mediated effects.

Specimen requirement - 5 ml of peripheral blood collected in gel vacutainer tube and plasma/serum is isolated.

Reporting time - 1-5 day

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E-mail: infocmg@genetics.sci.am