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The ranges I was suggesting are based on the Vermuelen calculated values.  Even if you measure free T directly with equilibrium dialysis, I think it still makes sense to determine your Vermeulen free T.  So many men have been using it for so many years that it gives you a good basis for comparison.  In most cases, when you hear broad statements made like "men usually feel good between X-X ng/dL", those levels are Vermeulen values.  I would call it the de facto standard.