Laboratory reference method for determining free testosterone in men. Free testosterone is generally adequate for most evaluations of suspected hypogonadism.
Quantitative Equilibrium Dialysis/High Performance Liquid Chromatography-Tandem Mass Spectrometry
Collect between 6-10 a.m.
Serum separator tube or green (sodium or lithium heparin).
Separate from cells ASAP or within 2 hours of collection. Transport 1 mL serum or plasma. (Min: 0.4 mL)
After separation from cells: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 2 months
|Male Free Testosterone, pg/mL|
|18 years and older: 47-244 pg/mL|
Laboratory Developed Test (LDT)
|Component Test Code*||Component Chart Name||LOINC|
|2003247||Testos Free Adult Male ED/LC-MS/MS||2991-8|
- Direct Dialysis (Testosterone, Free, Adult Males by ED/LC-MS/MS)