Answer: Tests for Vitamin D Deficiency. The most accurate way to measure how much vitamin D is in your body is the 25-hydroxy vitamin D blood test. A level of 20 nanograms/milliliter to 50 ng/mL is considered adequate for healthy people. A level less than 12 ng/mL indicates vitamin D deficiency.
Anwered By: Dr. (Maj.) Sharad Shrivastava
Posted on: 01 December 2018
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