Preferred Specimen(s) 2 mL serum collected in a (red-top) tube (no gel). Specify age and sex on test requisition.
Transport Container Plastic screw-cap vial
Transport Temperature
- Ambient 3 days,
- Refrigerated 14 days
Reject Criteria Body fluids
Methodology
- Automated ICMA
- Extraction
- Chromatography
- Chemiluminescence
Clinical Significance Testosterone circulates almost entirely bound to transport proteins. Normally less than 1% is free. Testosterone measurements are used to assess erectile dysfunction, infertility, gynecomastia, osteoporosis, and hormone replacement therapy.