Testosterone, Free and Total by Immunoassay, Adult Male TSTRF
| Method(s) | Chemiluminescent Immunoassay | |||||||||||
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| Components | Total Testosterone, SHBG, Free Testosterone | |||||||||||
| Specimen Required | ||||||||||||
| Collect | One 5 mL gold (SST) top tube. Heparinized plasma also acceptable. |
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| Transport | 1 mL serum at 2-8°C. |
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| Remarks | Specimen should be collected between 6 and 10 am. For females and children under 14 years, select LCMS-based assays for required sensitivity. |
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| Stability | Ambient: 8 hours; Refrigerated: 2 days; Frozen: 1 month |
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| Schedule | Daily, except Sundays | |||||||||||
| Billing Code | 1010459 | |||||||||||
| CPTCode | 84403 Total testosterone, 84270 SHBG | |||||||||||
| Notes | The concentration of free testosterone is derived from a mathematical expression based on the constants for the binding of testosterone to sex hormone binding globulin and albumin. Results of the testosterone component of this test may be falsely elevated in patients taking over-the-counter biotin supplements. Results of the SHBG component of this test may be falsely decreased in patients taking over-the-counter biotin supplements. |
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| Preferred Specimen Collection Device(s) | ||||||||||||
| Reference Interval | ||||||||||||
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