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Reading the Numbers Honestly: The Full Specification Table With the evidence framed, here is the detailed side-by-side specification
(Just keep in mind: RBC testing is not available for all micronutrients, including vitamin D.) What your results actually mean (and why "normal" isn't always optimal) Once your blood is drawn, your levels are compared to a reference range of "normal" values for a nutrient to assess your status
But they are not interchangeable
18 Prevention Because of potential interactions from prolonged medication use, physicians should consider screening patients for vitamin B 12 deficiency if they have been taking proton pump inhibitors or H 2 blockers for more than 12 months, or metformin for more than four months
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