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Any of these would suffice but test #1 is expensive and #3 from Nelson's discountedlabs. would be the cheapest option!

Test #2 is the one I would get (cost/reference range).

1. 500726: Testosterone, Free, Mass Spectrometry/Equilibrium Dialysis (Endocrine Sciences) | Labcorp

Methodology:  Testosterone: high-pressure liquid chromatography (HPLC)/tandem mass spectrometry; free testosterone: equilibrium dialysis

2. 070038: Testosterone, Free, Equilibrium Ultrafiltration With Total Testosterone, LC/MS-MS | Labcorp

Methodology:  Free: equilibrium ultrafiltration; total: liquid chromatography/tandem mass spectrometry (LC/MS-MS) 

3. Testosterone, Total, LC/MS and Free (Equilibrium Dialysis)

Methodology:  Free: equilibrium dialysis; total: liquid chromatography/tandem mass spectrometry (LC/MS-MS)