Testosterone, Free and Total, LC/MS/MS

Test Code
36170

CPT Codes
84402, 84403

Includes
Total Testosterone, Free Testosterone (calculated)

Preferred Specimen
0.9 mL serum collected in a red-top tube (no gel)

Minimum Volume
0.38 mL

Other Acceptable Specimens
Heparinized plasma (green-top) tube

Instructions

Collect blood in a no additive red-top vaccutainer. Allow blood to clot. Centrifuge and pipette serum into a plastic vial. Do not send serum collected in a serum separator tube (SST).

Transport Container
Plastic screw-cap vial

Transport Temperature
Refrigerated

Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 2 years

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Serum Separator Tube (SST^®)

Methodology
Calculation (CALC) • Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS) • Tracer Equilibrium Dialysis

Reference Range
See Laboratory Report

Clinical Significance
Helpful in assessing testicular function in prepubescent hypogonadal males and in managing hirsutism, virilization in females.