Test Directory
| Test Code | ||||
| TESFC | ||||
| Test Name | ||||
| Testosterone, Free (Females and Children) | ||||
| Expected Turnaround Time | ||||
| 1 - 5 days | ||||
| Clinical Utility | ||||
| Provides a calculated value for free testosterone concentration using total testosterone measured by mass spectrometry. May be used to evaluate hyperandrogenism in children and cisgender females, monitor testosterone-suppressing hormone therapies (eg, antiandrogens or estrogens), evaluate testosterone status in individuals with protein-binding abnormalities, or evaluate hypogonadism in cisgender males. | ||||
| Specimen and Container Info | ||||
|
Preferred Specimen Type: Serum Alternate Specimen Type: Plasma Preferred Collection Container: Gold Top, Serum Separator Alternate Collection Container: Green Top Tube (Sodium Heparin); OR Green Top Tube (Lithium Heparin) Desired Specimen Volume: 1 mL |
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| Collection Instructions | ||||
|
Collect specimen in gold top, serum separator tube; green top (sodium heparin) tube; or green top (lithium heparin) tube via venipuncture. Centrifuge and transfer serum or plasma to plastic aliquot tube. |
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| Processing and Submission Instructions | ||||
| Collect between 6-10 a.m. | ||||
| Transport Instructions | ||||
|
Transport to the laboratory refrigerated. |
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| Stability Requirements | ||||
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| Causes for Rejection | ||||
| EDTA plasma. | ||||
| Methodology | ||||
| Quantitative High Performance Liquid Chromatography-Tandem Mass Spectrometry/Electrochemiluminescent Immunoassay/Calculation | ||||
| Reference Intervals | ||||
|
See patient report. |
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| Reference Lab | ||||
| ARUP Laboratories | ||||
| Testing Schedule | ||||
| Routine, daily | ||||
The American Medical Association (AMA) Current Procedural Terminology (CPT) codes published by HNL Lab Medicine are guidelines and are intended for informational purposes only. CPT coding is the exclusive responsibility of the billing entity. View the Terms.
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