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Testosterone Replacement, Low T, HCG, & Beyond
Testosterone Basics & Questions
Free T Lab Ranges/Units Confusion
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<blockquote data-quote="bennettjc" data-source="post: 191927" data-attributes="member: 41390"><p>Hi!</p><p>This is post for fellow obsessives and professionals and everyone else. ;-)</p><p></p><p>I have heard various providers speak about desirable Free T levels being about "25-50." And it makes sense that units being attached to these ranges be in ng/dl because those are the units that Total T is reported as (in the USA anyway). Free T is supposed to be 1.5-3% of Total T, so why wouldn't the units used be the same as Total T to be user friendly?</p><p></p><p>BUT - I've gotten 3 different types of Free T tests from the 2 big labs. In each case the units are reported as pg/ml. I did a quick search and learned that to convert pg/ml you simply divide by 10. Why would the big two, LabCorp and Quest, switch the units on us?</p><p></p><p>Below I've listed the 3 tests and the reported "normal" ranges in pg/ml and ng/dl.</p><p></p><p>Also, I remember hearing somewhere that LabCorp has been reporting one of their units incorrectly and they refuse to change it! It would seem from the below that the wrong reports units would be on their Direct Free T - they report pg/ml but they really mean ng/dl as that would put their 7.2-24 in the same order of magnitude as their MS/Dialyis range and the competitor's range.</p><p></p><p>Quest Dialysis: 35.0-155.0 pg/ml (or 3.5-15.5 ng/dl)</p><p>LabCorp "Direct" (Direct analog enzyme immunoassay (EIA) ) : 7.2-24.0 pg/ml (or .72-2.4ng/dl)</p><p>LabCorp MS/Dialysis: 52-180 pg/ml (or 5.2-18ng/dl)</p><p></p><p>On a related note - on another thread "Madman" referred to the LabCorp MS/Dialysis as the gold standard. That's good to hear as I prefer my local LabCorp. But I am curious how that test was designated the best. </p><p>Thanks!</p><p>Bennett</p></blockquote><p></p>
[QUOTE="bennettjc, post: 191927, member: 41390"] Hi! This is post for fellow obsessives and professionals and everyone else. ;-) I have heard various providers speak about desirable Free T levels being about "25-50." And it makes sense that units being attached to these ranges be in ng/dl because those are the units that Total T is reported as (in the USA anyway). Free T is supposed to be 1.5-3% of Total T, so why wouldn't the units used be the same as Total T to be user friendly? BUT - I've gotten 3 different types of Free T tests from the 2 big labs. In each case the units are reported as pg/ml. I did a quick search and learned that to convert pg/ml you simply divide by 10. Why would the big two, LabCorp and Quest, switch the units on us? Below I've listed the 3 tests and the reported "normal" ranges in pg/ml and ng/dl. Also, I remember hearing somewhere that LabCorp has been reporting one of their units incorrectly and they refuse to change it! It would seem from the below that the wrong reports units would be on their Direct Free T - they report pg/ml but they really mean ng/dl as that would put their 7.2-24 in the same order of magnitude as their MS/Dialyis range and the competitor's range. Quest Dialysis: 35.0-155.0 pg/ml (or 3.5-15.5 ng/dl) LabCorp "Direct" (Direct analog enzyme immunoassay (EIA) ) : 7.2-24.0 pg/ml (or .72-2.4ng/dl) LabCorp MS/Dialysis: 52-180 pg/ml (or 5.2-18ng/dl) On a related note - on another thread "Madman" referred to the LabCorp MS/Dialysis as the gold standard. That's good to hear as I prefer my local LabCorp. But I am curious how that test was designated the best. Thanks! Bennett [/QUOTE]
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Testosterone Replacement, Low T, HCG, & Beyond
Testosterone Basics & Questions
Free T Lab Ranges/Units Confusion
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