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Test Code
QTEST
Test Name
Testosterone, Free and Total
CPT Codes
84402, 84403
Included Tests
  • Testosterone, Total, MS
  • Testosterone, Free
Expected Turnaround Time
3 - 4 days
Clinical Utility

Helpful in assessing testicular function in prepubescent hypogonadal males and in managing hirsutism, virilization in females.
Specimen and Container Info

Preferred Specimen Type: Serum

Alternate Specimen Type: Plasma

Preferred Collection Container: Red Top, Plain

Alternate Collection Container: Gold Top, Serum Separator or Green Top (Sodium or Lithium Heparin)

Desired Specimen Volume: 1.8 mL
Collection Instructions
  1. Collect a red top, plain tube via venipuncture.
  2. Allow specimen to clot at room temperature.
Processing and Submission Instructions
  1. Separate serum from cells.
  2. Transfer 1.8 mL of serum to a clear aliquot tube (screw cap).
Transport Instructions

Transport to the laboratory refrigerated. 
Stability Requirements

Room Temperature

 7 days

Refrigerated

21 days

Frozen

2 years
Causes for Rejection
  • Gross hemolysis 
  • Grossly lipemic
Methodology
Chromatography/Mass Spectrometry | Equilibrium Dialysis
Reference Intervals

 See patient report.
Alternate Names
  • Testosterone, Free (Dialysis) and Total, MS
  • Free & Total Testosterone
  • Free and Unbound Testosterone
Reference Lab
Quest Diagnostics Nichols Institute
Testing Schedule
Routine, daily
The American Medical Association (AMA) Current Procedural Terminology (CPT) codes published by HNL Lab Medicine are guidelines and are intended for informational purposes only. CPT coding is the exclusive responsibility of the billing entity. View the Terms.
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