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Test Code TETTB Testosterone, Total and Bioavailable, Serum

Additional Codes

Epic EAP Mayo Code
LAB839 TTBS

Test Down Notes

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

Reporting Name

Testosterone, Total and Bioavail, S

Useful For

Recommended second-level test for suspected increases or decreases in physiologically active testosterone:

-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 testosterone therapy or antiandrogen therapy

Profile Information

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

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Serum Red


Ordering Guidance


This is the preferred second-level test for suspected increases or decreases in physiologically active testosterone.



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: 1 mL

Collection Instructions: Centrifuge and aliquot serum into a plastic vial.


Specimen Minimum Volume

0.6 mL

Specimen Stability Information

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

Day(s) Performed

Monday through Friday

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.

CPT Code Information

84403

84410

LOINC Code Information

Test ID Test Order Name Order LOINC Value
TTBS Testosterone, Total and Bioavail, S 58716-2

 

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

Report Available

2 to 5 days

Reject Due To

Gross hemolysis OK
Gross lipemia Reject
Gross icterus OK

Method Name

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

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