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Never compare different assays let alone reference ranges from different labs.


When getting blood work stick to using the same lab/assays (most accurate).


Regarding free testosterone, the most accurate assay is the gold Standard Equilibrium Dialysis or Ultrafiltration (next best).


Forget relying on the direct immunoassay or linear law-of-mass action Vermeulen calculated method.





LABCORP:


EQUILIBRIUM DIALYSIS

[URL unfurl="true"]https://www.labcorp.com/tests/500726/testosterone-free-mass-spectrometry-equilibrium-dialysis-endocrine-sciences[/URL]


EQUILIBRIUM ULTRAFILTRATION

[URL unfurl="true"]https://www.labcorp.com/tests/081786/testosterone-free-equilibrium-ultrafiltration-with-total-testosterone[/URL]





NELSONS DiscountedLabs



[URL unfurl="true"]https://www.discountedlabs.com/testosterone-free-dialysis-and-total-ls-ms-ms[/URL]


Look over post #13

[URL unfurl="true"]https://www.excelmale.com/forum/threads/complete-apathy-depression-from-too-high-e2.21596/#post-185169[/URL]


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