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Testosterone Replacement, Low T, HCG, & Beyond
Blood Test Discussion
Calculate Free Testosterone with TruT by FPT
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<blockquote data-quote="Cataceous" data-source="post: 146528" data-attributes="member: 38109"><p>I think this should be the way of the future. The testing labs are part of the problem because they bundle the direct free T test with total T for a low price, encouraging its use.</p><p></p><p>Calculated free T is so consistent that I've been comfortable identifying a spot on the Vermeulen scale (10 ng/dL) as a threshold, below which guys may start to have symptoms of low testosterone. I'll just have to teach myself to start thinking in the TruT scale, which is about 50% higher. But it's just a multiplicative factor.* With the direct free T tests you can get gross inconsistencies that leave you scratching your head, and this is demonstrated in various research studies.</p><p></p><p>[*Edit: It's not nearly so simple, because if there is a linear factor across different testosterone levels then it is at least dependent on SHBG. E.g. when SHBG is 30 nmol/L then Vermeulen free T ~= 2/3 TruT, but with SHBG at 10 VcfT ~= 0.9 TruT, for albumin at 4.3]</p></blockquote><p></p>
[QUOTE="Cataceous, post: 146528, member: 38109"] I think this should be the way of the future. The testing labs are part of the problem because they bundle the direct free T test with total T for a low price, encouraging its use. Calculated free T is so consistent that I've been comfortable identifying a spot on the Vermeulen scale (10 ng/dL) as a threshold, below which guys may start to have symptoms of low testosterone. I'll just have to teach myself to start thinking in the TruT scale, which is about 50% higher. But it's just a multiplicative factor.* With the direct free T tests you can get gross inconsistencies that leave you scratching your head, and this is demonstrated in various research studies. [*Edit: It's not nearly so simple, because if there is a linear factor across different testosterone levels then it is at least dependent on SHBG. E.g. when SHBG is 30 nmol/L then Vermeulen free T ~= 2/3 TruT, but with SHBG at 10 VcfT ~= 0.9 TruT, for albumin at 4.3] [/QUOTE]
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Testosterone Replacement, Low T, HCG, & Beyond
Blood Test Discussion
Calculate Free Testosterone with TruT by FPT
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