For some reason two different units are used in parallel to describe 25(OH)-Vitamin-D blood concentration, namely Nanogramm per Milliliter [ng/ml] and Nanomol per Liter [nMol/l]. As a result there is some likelyhood of confusion when comparing different diagnostic test results or reading scientific literature. Allways check the units, when comparing lab results or Vitamin D related lectures, publications, guidelines or recommendations.
However, the two units Nanogramm per Milliliter [ng/ml] and Nanomol per Liter [nMol/l] can be easily converted by either multiplying or dividing with the factor 2.5 (1 ng/ml = 2.5 nMol/l).
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