Clinical Significance
Testosterone, Free (Dialysis) and Total, MS - Helpful in assessing testicular function in prepubescent hypogonadal males and in managing hirsutism, virilization in females.

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

Alternative Specimen(s)
1.8 mL plasma collected in a sodium heparin (green-top) or lithium heparin (green-top) tube

Minimum Volume
0.9 mL

Collection Instructions
Specify age and sex on test request form

Transport Container
Transport tube

Transport Temperature
Room temperature

Specimen Stability
Room temperature: 7 days
Refrigerated: 21 days
Frozen: 2 years
Reject Criteria
Gross hemolysis • Grossly lipemic • Serum Separator Tube (SST®)

Includes
Testosterone, Total, MS and Testosterone, Free (Dialysis)

Methodology
Chromatography/Mass Spectrometry • Equilibrium Dialysis • Calculation (CALC)

Assay Category
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Reference Range(s)
See Laboratory Report