Specimen Requirements

Title

Testosterone, Free, Bioavailable and Total

Specimen Requirement

Includes: Testosterone, Total, Testosterone Free – Calculated; Testosterone, Bioavailable – Calculated, Sex Hormone Binding Globulin; Albumin.

Collect red top, promptly centrifuge, transfer 2.8 mL serum to a screw top transport tube, indicate sample type on tube and send.

Methodology

Liquid Chromatography Tandem Mass Spectrometry, Calculation, Spectrophotometry, Immunochemiluminescent Assay

Stability

Room temp: 7 days, Refrigerated: 7 days, Frozen: 28 days

Reference Range

By Report*

Turnaround

4-6 days

Clinical Use

Helpful in assessing testicular function in males and managing hirsutism, virilization in females.

Test Code

TFBTW