Aids in the evaluation of suspected hypogonadism in men with a total testosterone level at the lower limit of the normal range. Not recommended for use in women and children.
Quantitative Electrochemiluminescent Immunoassay
Total Testosterone and SHBG are measured and free testosterone is estimated from these measurements.
Within 24 hours
Collect specimen between 6-10 a.m.
Serum separator tube or green (lithium heparin).
Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.4 mL)
After separation from cells: Ambient: 48 hours; Refrigerated: 1 week; Frozen: 2 months
14-15 years: 3-138 pg/mL
16-17 years: 38-173 pg/mL
18 years and older: 47-244 pg/mL
Tanner Stage IV: 35-169 pg/mL
Tanner Stage V: 41-239 pg/mL
The concentration of free testosterone is derived from a mathematical expression based on the constant for the binding of testosterone to sex hormone binding globulin (SHBG).
This test is not recommended for females or children. For testing on females or children refer to Testosterone Free, Females or Children (0081059).
|Component Test Code*||Component Chart Name||LOINC|
|0070113||Testosterone, Free Calculation||2991-8|
- Free testosterone
- serum testosterone free