Testosterone, Free, Bioavailable and Total, Males (Adult), Immunoassay
Test code
CPT code(s)*
Clinical significance
Test resources
Test FAQ
Details
Includes
Testosterone, Total, Males (Adult), Immunoassay
Albumin
Sex Hormone Binding Globulin (SHBG)
Testosterone, Free and Bioavailable (calculated)
Specimen requirements | |
|---|---|
| Patient preparation | Testosterone, Total, Males (Adult), Immunoassay: Due to changes in testosterone levels throughout the day, two morning (8:00-10:00 a.m.) specimens obtained on different days are recommended by The Endocrine Society for screening. |
| Preferred specimen(s) | 2 mL serum collected in a red-top tube (no gel) |
| Alternative specimen(s) | Serum separator tube (SST) |
| Minimum volume | 1.5 mL |
| Collection instructions | Dietary supplements containing biotin may interfere in assays and may skew analyte results to be either falsely high or falsely low. For patients receiving the recommended daily doses of biotin, draw samples at least 8 hours following the last biotin supplementation. For patients on mega-doses of biotin supplements, draw samples at least 72 hours following the last biotin supplementation. |
| Transport container | Transport tube |
| Transport temperature | Room temperature |
| Specimen stability | See individual tests |
| Reject criteria | See individual tests |
Reference Range(s)
Testosterone, Total, Males (Adult), Immunoassay
| Male | 250-827 ng/dL |
| Female | Not applicable |
| Albumin | 3.6-5.1 g/dL |
Sex Hormone Binding Globulin
| Age | Male (nmol/L) | Female (nmol/L) | ||||||
| <3 Years | Not established | Not established | ||||||
| 3-9 Years | 32-158 | 32-158 | ||||||
| 10-13 Years | 20-166 | 24-120 | ||||||
| 14-17 Years | 20-87 | 12-150 | ||||||
| 18-55 Years | 10-50 | 17-124 | ||||||
| >55 Years | 22-77 | 14-73 |
Free Testosterone
| Age | Male (pg/mL) | Female |
| 18-69 Years | 46.0-224.0 | Not applicable |
| >69 Years | 6.0-73.0 | Not applicable |
| Age | Male (ng/dL) | Female |
| 18-69 Years | 110.0-575.0 | Not applicable |
| >69 Years | 15.0-150.0 | Not applicable |
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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