Home
HelpTest Code TESFT Testosterone Total and Free
Performing Laboratory
Hunterdon Medical Center
Useful For
Total testosterone measurement is the primary tool for assessing hypoandrogenism. The majority of total serum testosterone (60%-90%) is bound to Sex Hormone Binding Globulin (SHBG) and unavailable to its target tissues. Most of the remaining bioavailable testosterone is bound to albumin, leaving approximately 0.5%-2% circulating in free form.
Free testosterone assessment is useful as a primary or secondary measure of androgen activity in men and women. Free testosterone is calculated using the measured levels of total testosterone, SHBG and albumin.
Test Includes
- Testosterone, Total
- Free Testosterone (calculation)
- Sex Hormone Binding Globulin
Specimen Requirements
| Container/Tube | |
| Acceptable | PST (Li Hep) Gel- Mint Green Top |
| Acceptable | SST |
| Specimen Volume | 3.0mL |
| Minimum Volume | 1.0mL |
Specimen Type
Plasma / Serum
Specimen Transport Temperature
Ambient
Specimen Stability
| Specimen | Temperature | Time Frame |
| Plasma | Refrigerated 2-8°C | 2 days |
| Serum-gel tube | Refrigerated 2-8°C | 3 days |
Day(s) Test Set up
Monday through Sunday
Reference Values
| Testosterone | Female | Male | Units |
| 14.00-76.00 | 241.00-827.00 | ng/dL | |
| FreeTestosterone | Female | Male | Units |
| 0.1-0.6 | 5.2-28.0 | ng/dL | |
| Sex Hormone Binding Globulin | |||
| Age | Female | Male | Units |
| 21-49 years | 24.60-122.00 | 16.50-55.90 | nmol/L |
| 50 years and above | 17.30-125.00 | 19.30-76.40 | nmol/L |
Methodology
ECLIA: Electrochemiluminescence Immunoassay
CPT Code
| Test | CPT |
| Total Testosterone | 84403 |
| Free Testosterone | 82040 |
| Sex Hormone Binding Globulin | 84270 |
Loinc Code
| Test | Loinc |
| Total Testosterone | 2986-8 |
| Free Testosterone | 2991-8 |
| Sex Hormone Binding Globulin | 13967-5 |