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Testosterone Replacement, Low T, HCG, & Beyond
Testosterone Basics & Questions
Target T levels & Defy
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<blockquote data-quote="Cataceous" data-source="post: 168421" data-attributes="member: 38109"><p>In absolute terms the direct free T measurement has no relationship with reality. We know that a typical free T fraction is around 2% of total, so for total T of 600 ng/dL that yields 120 pg/mL, much greater than 20. However, the absolute numbers aren't so important; if direct free T measurements were well correlated with Tru-T then you would be able to multiply one by a constant to get the other. It's the lack of a linear correlation that makes the direct free T test unreliable. Simply put, it's going to be wrong often enough that it should not be used.</p></blockquote><p></p>
[QUOTE="Cataceous, post: 168421, member: 38109"] In absolute terms the direct free T measurement has no relationship with reality. We know that a typical free T fraction is around 2% of total, so for total T of 600 ng/dL that yields 120 pg/mL, much greater than 20. However, the absolute numbers aren't so important; if direct free T measurements were well correlated with Tru-T then you would be able to multiply one by a constant to get the other. It's the lack of a linear correlation that makes the direct free T test unreliable. Simply put, it's going to be wrong often enough that it should not be used. [/QUOTE]
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Testosterone Replacement, Low T, HCG, & Beyond
Testosterone Basics & Questions
Target T levels & Defy
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