Unbound testosterone, Testosterone Bioavailable
Up to 7 days
Chemiluminescence Immunoassay
Male (pg/mL) 0-17 years: Not established 18-39 years: 12.30 - 46.60, 40-59 years: 9.57 - 40.60, ≥60 years: 7.72 - 31.40 Female (pg/mL) 0-17 years: Not established, 18-39 years: ≤ 5.45, ≥40 years: ≤ 4.43
Results are reported in conventional units (pg/mL).
Accredited NRL Laboratory
Weekly
Useful for assessing hirsutism and signs of masculinization in women, and for evaluating testicular function in clinical conditions where testosterone-binding proteins (such as SHBG) may be altered.
Serum
Minimum 0.5 mL
Serum Separator Tube (SST; Gold Top), Plain Serum (Red Top)
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
Samples should be sent to the laboratory as soon as possible after collection. If this is not possible, serum samples must be centrifuged within 2 hours and transported refrigerated (2 to 8°C).
| Temperature | Period |
|---|---|
| Room temperature | 8 hours at 5 to 25°C |
| Refrigerated | 7 days at 2 to 8 °C |
| Frozen | 3 months at -20°C |