ARUP's Laboratory Test Directory
| 0070111: Testosterone Free, Adult Male |
| Test Mnemonic: FREE T2 | |
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Methodology: Electrochemiluminescent Immunoassay The concentration of free testosterone is derived from a mathematical expression based on the constant for the binding of testosterone to sex hormone binding globulin. Performed: Sun-Sat Reported: Within 24 hours |
| Specimen Required: | |
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Collect: One 4 mL SST or green (lithium heparin). Specimen should be collected between 6-10 a.m.
Transport: 1 mL serum or plasma at 2-8°C. (Min: 0.4 mL) Submit specimen in an ARUP Standard Transport Tube. Pediatric Collection/Transport: 0.4 mL serum or plasma at 2-8°C. Remarks: Separate serum from cells ASAP. Unacceptable Conditions: EDTA plasma. Stability: After separation from cells: Ambient: 2 days; Refrigerated: 1 week; Frozen: 2 months |
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| Reference Interval: |
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Male: 14-15 years: 3-138 pg/mL 16-17 years: 38-173 pg/mL 18 years and older: 47-244 pg/mL Tanner Stage IV: 35-169 pg/mL Tanner Stage V: 41-239 pg/mL |
| Interpretive Data: | |
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To convert to pmol/L, multiply pg/mL by 3.47. The concentration of free testosterone is derived from a mathematical expression based on the constant for the binding of testosterone to sex hormone binding globulin. |
| Note: | |
| This test is not recommended for females or children. For testing on females or children refer to Testosterone Free, Females or Children (0081059). |
| CPT Code(s): | |
| 84402 |