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Quest Diagnotics vs. LabCorp results: Buried deep inside this site I read there was difference between Quest's numbers and LabCorp, and I am trying to figure out what my real results are. My very depressed young adult daughter–who ALWAYS becomes depressed in November and doesn't come out of it until early March– was tested through Quest and her results were 37 ng/ml. How does that compare to the LabCorp scale, and of the two, which is the more accurate? It turns out my daughter is also deficient in B12 and Folate–which we began supplementing immediately–but she just learned of her VD3 score, and I am now giving her 10,000 IU daily plus K2 and MgCitrate. We live in Florida and all experience VD3 deficiency, despite the fact that we have a boat, a pool, and do outdoor work! Mine level has been as low as 17 and my husband 19. Thanks for any input.

Asked by  kimanjo78271600 on November 24, 2015

  •  kimanjo78271600 on

    See title

    Answered by  kimanjo78271600 on
  •  IAW on

    The last thing that I could find from 2009 was “By the way, I believe that Quest Diagnostics is now offering reliable 25(OH)D blood tests”.”Unfortunately, I believe they are reliably 25% higher than the gold standard, DiaSorin RIA, the test used in virtually all the recent studies, so if you use Quest, divide their results by 1.3″.” Shoot for >50 ng/mL” . This was written by Dr. Cannell.
    So for your daughter her 37ng/ml by Quest could/may equal 28ng/ml. Either figure is not 50ng/ml or greater. So if your blood work needs to be done through Quest, I would just keep this in mind. The high end of the range is 100ng/ml but science already knows that 150ng/ml will not hurt you.
    So I think you are doing the right thing and I hope she feels better soon.
    What most people do not realize is that you have to expose a large area (back, stomach, legs) of your body and it needs to be fairly close to 12 noon in order to be able to produce enough Vitamin D. This needs to happen everyday and not just on the weekends. If you are not fair skinned then you need even more time in the sun. Lying flat also produces more then just standing.

    Answered by  IAW on

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