Testosterone, Free (Dialysis) and Total, MS
Test code
CPT code(s)*
Test resources
Test FAQ
Algorithm
Details
Includes
Testosterone, Total, MS and Testosterone, Free (Dialysis)
Methodology
Chromatography/Mass Spectrometry • Equilibrium Dialysis • Calculation (CALC)
Assay category
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Alternative name(s)
F Testo,Free & Total Testosterone, LC/MS/MS,Testosterone Index,Testosterone,Total/Free, Pediatric,Dialyzable Testosterone,Fractionated Testosterone,Free and Unbound Testosterone
Specimen requirements | |
|---|---|
| Patient preparation | None Specified |
| Preferred specimen(s) | 1.8 mL serum |
| Alternative specimen(s) | Plasma collected in: Sodium heparin (green-top) tube or lithium heparin (green-top) tube |
| Minimum volume | 0.9 mL |
| Collection instructions | Specify age and sex on test request form. Red-top tube (no gel): Allow blood to clot at room temperature. Centrifuge to separate the serum from the cells and immediately pour serum into a plastic transport tube. Serum separator tube: Allow blood to clot at room temperature, centrifuge, and remove serum from the gel immediately (not to exceed 48 hours) by pouring serum into a plastic transport tube. |
| Transport container | Transport tube |
| Transport temperature | Room temperature |
| Specimen stability | Room temperature: 7 days Refrigerated: 21 days Frozen: 2 years |
| Reject criteria | Gross hemolysis • Grossly lipemic |
Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.
*The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.
This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.
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