Testosterone, Free, Direct
Icon Photo
Gold Top (SST-Gel)
Useful For
Evaluate hirsutism and masculinization in women; evaluate testicular function in clinical states where the testosterone binding proteins may be altered (obesity, cirrhosis, thyroid disorders)
Special Instructions
State patient's age and sex on the test request form.
Specimen Requirements
Preferred:
Container/Tube: Gold Top (SST-Gel) or Red-top tube
Minimum Volume: 0.5 mL Blood
Collection Instructions: None
Storage Instructions: Room Temperature
Specimen Stability
Ambient: 14 days
Refrigerate: 14 days
Frozen: 14 days
Reject Due To
Gross lipemia; gross hemolysis; gross icterus
Turn Around Time
4-6 days
Reference Range
Gender/Age (y) |
Range (pg/mL) |
---|---|
Male |
|
0 to 19 |
Not established |
20 to 29 |
9.3−26.5 |
30 to 39 |
8.7−25.1 |
40 to 49 |
6.8−21.5 |
50 to 59 |
7.2−24.0 |
>59 |
6.6−18.1 |
Female |
|
0 to 19 |
Not established |
>19 |
0.0−4.2 |
Methodology
Direct analog enzyme immunoassay (EIA)
CPT
84402