Testosterone, Free, Bioavailable and Total, MS :
Fasting Required: No
Lab: Quest Diagnostics
Specimen: Blood
Results: Average processing time 4-7 days
**plus 8-10 day delay due to an instrumentation issue** Note: Result turnaround times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.
Special Instructions: Dietary supplements containing biotin may interfere in assays and may skew results to be either falsely high or falsely low. For patients receiving the recommended daily doses of biotin, draw samples at least 8 hours following the last biotin supplementation. For patients on mega-doses of biotin supplements, draw samples at least 72 hours following the last biotin supplementation.
Description: Free and bioavailable testosterone testing is indicated when the total testosterone is near the lower limit of the adult male reference range, and diagnosis of hypogonadism is being considered in men and mild hyperandrogenism is being considered in women. In boys of pubertal age, free and bioavailable testosterone levels may be a better indicator of hypogonadism than total testosterone levels. Low concentrations of the free and bioavailable forms may indicate delayed puberty.
Typically, free and bioavailable testosterone levels parallel the total testosterone level. However, this may not be the case when sex hormone-binding globulin (SHBG) concentration is affected by certain medical conditions or medicines, including: Liver disease and severe systemic illnesses, Inherited abnormalities in SHBG, Treatment with corticosteroids or sex steroids, eg, oral conjugated estrogen. Women with polycystic ovarian syndrome (PCOS) may have insulin resistance that is associated with low levels of SHBG. In this circumstance, free and bioavailable testosterone may be elevated more than the total testosterone level.
Includes:
Lab: Quest Diagnostics
Specimen: Blood
Results: Average processing time 4-7 days
**plus 8-10 day delay due to an instrumentation issue** Note: Result turnaround times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.
Special Instructions: Dietary supplements containing biotin may interfere in assays and may skew results to be either falsely high or falsely low. For patients receiving the recommended daily doses of biotin, draw samples at least 8 hours following the last biotin supplementation. For patients on mega-doses of biotin supplements, draw samples at least 72 hours following the last biotin supplementation.
Description: Free and bioavailable testosterone testing is indicated when the total testosterone is near the lower limit of the adult male reference range, and diagnosis of hypogonadism is being considered in men and mild hyperandrogenism is being considered in women. In boys of pubertal age, free and bioavailable testosterone levels may be a better indicator of hypogonadism than total testosterone levels. Low concentrations of the free and bioavailable forms may indicate delayed puberty.
Typically, free and bioavailable testosterone levels parallel the total testosterone level. However, this may not be the case when sex hormone-binding globulin (SHBG) concentration is affected by certain medical conditions or medicines, including: Liver disease and severe systemic illnesses, Inherited abnormalities in SHBG, Treatment with corticosteroids or sex steroids, eg, oral conjugated estrogen. Women with polycystic ovarian syndrome (PCOS) may have insulin resistance that is associated with low levels of SHBG. In this circumstance, free and bioavailable testosterone may be elevated more than the total testosterone level.
Includes:
- Total Testosterone
- Free Testosterone
- Bioavailable Testosterone (calculated)
- Sex Hormone Binding Globulin
- Albumin