Test Directory

Testosterone, Total and Free, Serum

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Updated Test Information:

Test Description
Testosterone, Total and Free, Serum
Synonym(s)
Testosterone, Total and Free
Test ID
TGRP
General Information
Useful for:
Alternative, second-level test for suspected increases or decreases in physiologically active testosterone (preferred:
TTBS / Testosterone, Total and Bioavailable, Serum); indications:
-Assessment of androgen status in cases with suspected or known sex hormone-binding globulin-binding abnormalities
-Assessment of functional circulating testosterone in early pubertal boys and older men
-Assessment of functional circulating testosterone in women with symptoms or signs of hyperandrogenism, but normal total testosterone levels
-Monitoring of testosterone therapy or antiandrogen therapy in older men and in females
Specimen Type
Serum
Specimen Requirements
Red Top
Stability
Refrigerated (preferred) 14 days
Frozen 60 days
Unacceptable Specimen Conditions
Gross hemolysis Reject
Gross lipemia OK
Gross icterus OK
Other Serum Gel
Methodology
FRTST: Equilibrium Dialysis
TTST: Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Estimated TAT
3-5 days
Testing Schedule
Monday-Sunday
Test Includes
FRTST Testosterone, Free
TTST Testosterone, Total
CPT Code(s)
84402
84403
Minimum Sample Volume
1 mL
Reference Range File View/Download File
Performing Lab
Mayo
LOINC Code(s)
2991-8, 2986-8