ARUP's Laboratory Test Directory
| 0070111: Testosterone Free, Adult Male |
| Test Mnemonic: FREE T2 | |
|
#ExistMethodology>
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. *ExistMethodology> #ExistPerformed> Performed: Sun-Sat *ExistPerformed> #ExistReported> Reported: Within 24 hours *ExistReported> |
| Specimen Required: | |
|
#ExistCollect>
Collect: One 4 mL SST or green (lithium heparin). Specimen should be collected between 6-10 a.m.
*ExistCollect> #ExistTransport> Transport: 1 mL serum or plasma at 2-8°C. (Min: 0.4 mL) Submit specimen in an ARUP Standard Transport Tube. *ExistTransport> #ExistPedCollectTransport> Pediatric Collection/Transport: 0.4 mL serum or plasma at 2-8°C. *ExistPedCollectTransport> #ExistRemarks> Remarks: Separate serum from cells ASAP. *ExistRemarks> #ExistConditions> Unacceptable Conditions: EDTA plasma. *ExistConditions> #ExistStability> Stability: After separation from cells: Ambient: 2 days; Refrigerated: 1 week; Frozen: 2 months *ExistStability> |
|
| Reference Interval: |
|
#ExistRefRange> 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 *ExistRefRange> |
| Interpretive Data: | |
|
#ExistInterpData>
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. *ExistInterpData> |
| 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 |