Andrewgen_Receptors' TRT Log

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Confused by American Standard Unit for Free Test

Ok I went back and pieced this together: As I shared above, Labcorp direct FT test is correlated but not absolute measure of fT. Quest dialysis fT test is. Maybe a picture will help: [image] Note the slope of the line on the left panel of the figure. Note that slope (approx 0.15) is very different than the slope of the right panel (~1.2). This confusion is from folks not being clear about units. The 20 and 30-50 numbers referenced are for an equilibrium dialysis FT measurement in ng/d…