ARUP's Laboratory Test Directory

Testosterone Free, Adult Male : 0070111

Mnemonic: FREE T2

Methodology: Electrochemiluminescent Immunoassay
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.
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Collect:  One 4 mL serum separator tube or green (lithium heparin).  Specimen should be collected between 6-10 a.m.

Storage/Transport Temperature:  1 mL serum or plasma at 2-8°C. (Min: 0.4 mL)  Submit specimen in an ARUP Standard Transport Tube.

Remarks:  Separate serum from cells ASAP. 

Unacceptable Conditions:  EDTA plasma.

Stability (collection to initiation of testing):  After separation from cells: Ambient: 2 days; 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: To convert to pmol/L, multiply pg/mL by 3.47.
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.
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
 
 

 

 

 
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