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A Testosterone Free Blood Test, Mass Spectrometry/Equilibrium Dialysis is helpful in assessing testicular function in prepubescent hypogonadal males and in managing hirsutism, virilization in females.
Free testosterone is the fraction of total testosterone that is not bound to circulating proteins. The free fraction is available to diffuse into target cells to interact with receptors or enzymes. The concentration of free testosterone is low relative to total testosterone, typically <3% of the total testosterone concentration. Total circulating testosterone is bound to sex hormone-binding globulin (SHBG) or albumin. Measurement of total and free testosterone is key in diagnosis of androgen excess or deficiency. Free testosterone is best measured by equilibrium dialysis, while total testosterone is measured by HPLC with tandem mass spectrometry.
Blood
Testosterone Total Serum Test
The Testosterone Total Serum Test measures total testosterone hormone levels in the blood to detect an abnormal level or hormone imbalance.
Androstenedione Blood Test, LC/MS
The Androstenedione Blood Test, LC/MS, measures androstenedione levels to evaluate adrenal gland, ovarian, or testicular function and to identify excess androgens in women.
Testosterone Total Blood Test, Women and Hypogonadal...
The Testosterone Total Blood Test, Women and Hypogonadal Males, screens for a hormonal imbalance by measuring the testosterone levels in the blood of women and hypogonadal males.
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