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Test ID BLOD0360 Testosterone, Free, Bioavailable, and Total, MS

Important Note

Early morning testosterone levels in young male individuals are, on average, 50% higher than p.m. levels. Reference values were established using specimens collected in the morning.

 

Effective 3/21/2025:  Due to reagent issues affecting Mayo testing, results will be delayed past the published turnaround time. Specimens will be stabilized upon arrival and processed in the order they are received. Specimens may take up to 12 days to result and the duration of the delay is expected to last up to 60 days or more. An update will be provided when standard testing resumes.


Specimen Required


Caution: Administration of STRENSIQ may interfere in certain assays and may falsely elevate values. For patients receiving STRENSIQ, consideration should be given to using alternate methods.

Collection Container/Tube:

Preferred: Red top

Acceptable: Serum gel

Submission Container/Tube: Plastic vial

Specimen Volume: 2.8 mL

Collections Instructions:

1. Draw blood in a plain red-top tube(s), serum gel tube(s) is acceptable.

2. Allow blood to clot at room temperature. Centrifuge and aliquot 2.8 mL of serum into a plastic vial.

3. Send refrigerate.


Secondary ID

75934

Method Name

Chromatography/Mass Spectrometry, Calculation (CALC), Spectrophotometry (SP), Immunochemiluminescent Assay

Reporting Name

Testosterone, Free, Bio, and Total

Specimen Type

Serum

Specimen Minimum Volume

1.3 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 7 days
  Frozen  28 days
  Ambient  7 days

Reject Due To

Gross hemolysis Reject
Gross lipemia Reject

Reference Values

See Laboratory Report

Day(s) Performed

Monday through Sunday

Report Available

6 to 8 days

Performing Laboratory

Quest Diagnostics Nichols Institute

Test Classification

This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. The assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

CPT Code Information

82040

84270

84403