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Amazing post. Love learning new things like this. Would of probably never known about these differences if it wasn’t for you, so thanks madman for that.


So you’re right, labcorp does offer both the direct and calculated by Vermeulin Equation. But I don’t think anyone is getting the calculated. The reference range for direct is (6.8−21.5) for 40-49 year old men. This is roughly the reference range we see with labcorp. With the labcorp test done by Vermeulen Equation the reference range is    

(30.3–183.2) for a 41-50 year old man. I’ve never seen someone have this reference range with their free T when using labcorp.


So even though labcorp offers the calculated free T by Vermeulin Equation, do you think anyone’s actually getting that version done? Seems like everyone’s getting the direct free T from labcorp. And you would probably recommend guys to switch over to the calculated free T test by Labcorp I would assume, correct?


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