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Test Code TESTOS Testosterone, Total, Bioavailable, and Free, Serum

Additional Codes

Epic EAP Mayo Code
LAB2929 TTFB

Test Down Notes

This test is temporarily unavailable due to concerns around acceptable turnaround times.   Order FFBTT as an alternative.

 

Reporting Name

Testosterone, Total, Bio, Free, S

Useful For

Second- or third-order test for evaluating testosterone status (eg, when abnormalities of sex hormone-binding globulin are present)

Profile Information

Test ID Reporting Name Available Separately Always Performed
TTST Testosterone, Total, S Yes Yes
FRTST Testosterone, Free, S No Yes
BATS Testosterone, Bioavailable, S No Yes

Method Name

BATS: Differential Precipitation/Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)

FRTST: Equilibrium Dialysis/Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)

TTST: Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Serum Red


Ordering Guidance


The preferred test for diagnosis of mild abnormalities of testosterone homeostasis, particularly if abnormalities in sex hormone-binding globulin function or levels are present, is TTBS / Testosterone, Total and Bioavailable, Serum.



Necessary Information


Patient's age and sex are required.



Specimen Required


Supplies: Sarstedt Aliquot Tube, 5 mL (T914)

Collection Container/Tube: Red top (serum gel/SST are not acceptable)

Submission Container/Tube: Plastic vial

Specimen Volume: 3.5 mL

Collection Instructions: Centrifuge and aliquot serum into a plastic vial


Specimen Minimum Volume

2 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Red Refrigerated (preferred) 14 days
  Frozen  60 days

Reject Due To

Gross hemolysis OK
Gross lipemia Reject
Gross icterus OK

Day(s) Performed

Monday through Saturday

CPT Code Information

84402

84403

84410

LOINC Code Information

Test ID Test Order Name Order LOINC Value
TTFB Testosterone, Total, Bio, Free, S 58716-2

 

Result ID Test Result Name Result LOINC Value
82978 Testosterone, Bioavailable, S 2990-0
3631 Testosterone Free 2991-8
8533 Testosterone, Total, S 2986-8

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.

Report Available

3 to 8 days