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Testosterone Replacement, Low T, HCG, & Beyond
Blood Test Discussion
Quest Diagnostics different ranges for Free T based on methodology?
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<blockquote data-quote="xqfq" data-source="post: 201100" data-attributes="member: 38167"><p>I've performed the Quest lab on the same day as Labcorp (about 20 minutes apart). Here is an example result:</p><p></p><p><strong>Quest:</strong></p><p>Testosterone: 1010 ng/dL</p><p>Free T: 189.2 pg/mL (Range: 35.0-155.0 pg/mL) ("Dialysis")</p><p></p><p><strong>Labcorp:</strong></p><p>Testosterone: 912 ng/dL</p><p>Free T: 21.7 pg/mL (Range: 8.7-25.1)</p><p></p><p>Based on this result as well as my subjective experience, I believe the Labcorp results are ~ 10x the quest results. But I am not sure.</p><p></p><p>I dislike the Quest test - I don't understand how it is so inexpensive if it's truly LC/MS/MS and equilibrium dialysis.</p><p></p><p>I performed a labcorp LC/MS/MS and free T by ultrafiltration and the results were wildly different (relative to the range upper limit) from the Quest "dialysis" results, when on the same protocol.</p></blockquote><p></p>
[QUOTE="xqfq, post: 201100, member: 38167"] I've performed the Quest lab on the same day as Labcorp (about 20 minutes apart). Here is an example result: [B]Quest:[/B] Testosterone: 1010 ng/dL Free T: 189.2 pg/mL (Range: 35.0-155.0 pg/mL) ("Dialysis") [B]Labcorp:[/B] Testosterone: 912 ng/dL Free T: 21.7 pg/mL (Range: 8.7-25.1) Based on this result as well as my subjective experience, I believe the Labcorp results are ~ 10x the quest results. But I am not sure. I dislike the Quest test - I don't understand how it is so inexpensive if it's truly LC/MS/MS and equilibrium dialysis. I performed a labcorp LC/MS/MS and free T by ultrafiltration and the results were wildly different (relative to the range upper limit) from the Quest "dialysis" results, when on the same protocol. [/QUOTE]
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Testosterone Replacement, Low T, HCG, & Beyond
Blood Test Discussion
Quest Diagnostics different ranges for Free T based on methodology?
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