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When the council suggests maintaining a vitamin D level of at least 50 ng/ml and an optimum range : 50-80 ng/ml are they referring to Lab Corp Values (venous blood) or ZRT LAB & Heartland Assay values (capillary blood)? I have found that Lab Corp values are always higher by as much as 18 ng/ml?

Asked by  Adelle Sperling on July 17, 2015

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