Testosterone, Free and Total by Immunoassay, Adult Male TSTRF
|Components||Total Testosterone, SHBG, Free Testosterone|
One 5 mL gold (SST) top tube. Heparinized plasma also acceptable.
1 mL serum at 2-8°C.
Specimen should be collected between 6 and 10 am.
For females and children under 14 years, select LCMS-based assays for required sensitivity.
Ambient: 8 hours; Refrigerated: 2 days; Frozen: 1 month
|CPTCode||84403 Total testosterone, 84270 SHBG|
The concentration of free testosterone is derived from a mathematical expression based on the constants for the binding of testosterone to sex hormone binding globulin and albumin.
|Preferred Specimen Collection Device(s)|