also known as Testosterone Free in Serum or Plasma by Detection limit <= 1.0 ng/dL
Testosterone circulates almost entirely bound to transport proteins: Normally less than 1-2% is free. The principal transport protein for testosterone is known as sex hormone binding globulin (SHBG)
| # | Retailer | Lab | Seen | Price | |
|---|---|---|---|---|---|
| 1 | Goodlabscheapest via Quest · seen today | Quest | today | $11 | order → |
| 2 | Jason Health via Quest · seen today | Quest | today | $30 | order → |
| 3 | DirectLabs via Quest Diagnostics · seen today | Quest Diagnostics | today | $37 | order → |
| 4 | Instalab via Multi-lab (4) · seen today | Multi-lab (4) | today | $37 | order → |
| 5 | HealthLabs seen today | — | today | $49 | order → |
| 6 | Ulta Lab Tests via Quest · seen 5mo ago | Quest | 5mo ago | $52.95 | order → |
| 7 | Walk-In Lab via LabCorp · seen today | LabCorp | today | $59 | order → |
| 8 | Personalabs via LabCorp · seen today | LabCorp | today | $98 | order → |
| 9 | True Health Labs seen 1mo ago | — | 1mo ago | $129 | order → |
| Cortisol, PM | 14 retailers | $8 |
| Progesterone Test | 13 retailers | $9 |
| Estrone | 13 retailers | $29 |
| Prolactin | 12 retailers | $9 |
| Estradiol | 12 retailers | $8 |
| Dihydrotestosterone Test | 12 retailers | $35 |
| Leptin Test | 10 retailers | $40 |
| Sex Hormone Binding Globulin (SHBG) | 10 retailers | $8 |