Test ID: ZG108
CPT code: 84410
LOINC:
Specimen Type: Red or SST
Frequency: 4 – 6 days
Instruction: 2 mL Serum from Red or SST, Refrigerated, Separate within 1 hour. Min 1.4 mL.
Text: Free and weakly bound testosterone (FWBT), also referred to as bioavailable testosterone, is thought to reflect an individual’s biologically active, circulating testosterone. FWBT includes free testosterone & testosterone that is bound to albumin. Elevated levels of FWBT are observed in female hirsutism.
Methodology: Ammonium sulfate precipitation; liquid chromatography/tandem mass spectrometry (LC/MS-MS)