reference ranges
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Where Laboratory Reference Ranges Actually Come From
The printed normal range is not a boundary between health and disease. It is a statistical description of where most of a selected healthy group happened…
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Vitamin D Testing and Why Labs Disagree on Normal
The same blood sample can return meaningfully different vitamin D results depending on which platform measures it, and the cut-off for deficiency is still argued over.
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What a Complete Blood Count Actually Measures
A complete blood count is three separate examinations printed on one page. Here is what each number counts and which ones carry the most information.
