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Testosterone, Free, by Dialysis and Mass Spectrometry (Adult Males or Individuals on Testosterone Hormone Therapy)

Order Name TEST FT M
Test Number: 3608125
Revision Date 10/11/2024
Test Name Methodology LOINC Code
Testosterone, Free, by Dialysis and Mass Spectrometry (Adult Males or Individuals on Testosterone Hormone Therapy)
Liquid Chromatography/Tandem Mass Spectrometry  
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 2 mL (2 mL) Serum TWO: Clot Activator (SST or Red No-Gel) Frozen
Instructions Please Collect TWO Clot Activator (SST or Red No-Gel) tubes to obtain enough Serum Specimen to obtain preferred volume of 2 mL of serum.
Specimen Type: Red-top tube or gel-barrier tube
Specimen Storage: Frozen
Volume: 2 mL; Minimum Volume: 1 mL (Note: This volume does not allow for repeat testing.)
Specimen Collection: Serum must be separated from cells within 45 minutes of venipuncture. Send serum in a plastic transport tube. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.
Special Instructions: State patient's age and sex on the request form.
Causes for Rejection: Gross lipemia; recently administered isotopes; plasma specimen; improper labeling; specimen drawn in citrate or ACD tube
Actual performing location: Testing is sent out by and performed at Esoterix Endocrinology Laboratory: (tc#501475) 
Specimen Stability: Ambient: 6 days, Refrigerated : 7 days, Frozen: 2.6 years (Freeze Thaw Cycles Stable x9)
GENERAL INFORMATION
Expected TAT 8-12 Days  
Clinical Use For Females and Children under 18 years use both of the following test codes:

Testosterone Total by LCMS [3602651]
Testosterone Free and Total with SHBG by LCMS [3602546] 
Performing Labcorp Test Code 500726 
CPT Code(s) 84402; 84403
Lab Section Reference Lab