Testosterone Free, Adult Male
0070111
 
Ordering Recommendation
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.
Mnemonic
FREE T2
Methodology
Quantitative Electrochemiluminescent Immunoassay
Total Testosterone and SHBG are measured and free testosterone is estimated from these measurements.
Performed
Sun-Sat
Reported
Within 24 hours
New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
Collect specimen between 6-10 a.m.  
Collect
Serum separator tube or green (lithium heparin).  
Specimen Preparation
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)  
Storage/Transport Temperature
Refrigerated.  
Unacceptable Conditions
EDTA plasma.  
Remarks
 
Stability
After separation from cells: Ambient: 48 hours; Refrigerated: 1 week; Frozen: 2 months  
Reference Interval
Male:
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
Interpretive Data
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).
Note
This test is not recommended for females or children. For testing on females or children refer to Testosterone Free, Females or Children (0081059).
CPT Code(s)
84402
Components
Component Test Code*Component Chart Name
0070113Testosterone, Free Calculation
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, contact interface support at interface.support@aruplab.com.
Cross References
  • Free testosterone
  • serum testosterone free