This test is used to evaluate the level of bioavailable testosterone in the blood. The free and weakly bound testosterone (FWBT) is different from sex hormone binding globulin-bound testosterone, as this testosterone is bound to albumin. Elevation of FWBT in women lead to abnormal growth of body hair (hirsutism). Decrease in FWBT in male lead to under developed testis and infertility. In pregnancy, the level of FWBT is increased.
LabEspy recommends Private MD Labs, Walk-In Lab, Direct Labs for this test.