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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="sammmy" data-source="post: 189494" data-attributes="member: 38594"><p>Actually the first graph illustrates exactly the discrepancy between labs/methods (I assume both by dialysis). If the two labs were 'measuring the same thing' then y = x and the slope must have been 1. Instead, the slope is 1.32, which means 'Free T by API 4000' (the y value) is consistently 32% larger than the 'Referral lab' (the x value). The article cites 'correlation close to 1' which simply means there is a linear relationship between x and y, but not necessarily y = x.</p><p></p><p>That's why the values of free T that I get from Quest Diagnostics (uses Dialysis and Mass Spectrometry) had never been even close to the values from online calculators, including TruT, although they might be linearly related.</p><p></p><p>The point is, values of different labs are aiming at measuring the same free T but they succeed measuring just some proxy of it, not the absolute value of it.</p></blockquote><p></p>
[QUOTE="sammmy, post: 189494, member: 38594"] Actually the first graph illustrates exactly the discrepancy between labs/methods (I assume both by dialysis). If the two labs were 'measuring the same thing' then y = x and the slope must have been 1. Instead, the slope is 1.32, which means 'Free T by API 4000' (the y value) is consistently 32% larger than the 'Referral lab' (the x value). The article cites 'correlation close to 1' which simply means there is a linear relationship between x and y, but not necessarily y = x. That's why the values of free T that I get from Quest Diagnostics (uses Dialysis and Mass Spectrometry) had never been even close to the values from online calculators, including TruT, although they might be linearly related. The point is, values of different labs are aiming at measuring the same free T but they succeed measuring just some proxy of it, not the absolute value of it. [/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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