Does anyone know what is the most accurate test to measure free testosterone of these two?

T4 Life · Jun 28, 2015

Testosterone, Free, LC/MS/MS

Methodology

Calculation (CALC) • Immunochemiluminescence Assay (ICMA) • Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS) • Spectrophotometric http://www.questdiagnostics.com/testcenter/TestDetail.action?ntc=90572

or

Testosterone, Free (Dialysis) and Total LC/MS/MS
Includes

Total Testosterone, Free Testosterone (calculated)
Methodology

Calculation (CALC) • Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS) • Tracer Equilibrium Dialysis
http://www.questdiagnostics.com/testcenter/TestDetail.action?ntc=36170

Nelson Vergel · Jun 29, 2015

The first on actually measures free T by liquid chromatography but does not tell you total T.

The second one measures total T by liquid chromatography and calculates free T (from SHBG and albumin)

I would use one that measures both free and total T by Liquid Chromatography/Mass spectrometry.

http://www.discountedlabs.com/testosterone-free-total/

Does anyone know what is the most accurate test to measure free testosterone of these two?

T4 Life

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Nelson Vergel

Founder, ExcelMale.com

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