Function Deficiency Vitamin D sources Toxicity Contacting a doctor Summary For adults, a level of vitamin D in the blood of 20 nanograms per milliliter (ng/mL) or above is generally What to expect. The 25-hydroxy vitamin D test involves providing a blood sample. To take a blood sample, a healthcare provider will first clean the skin on the person's arm. Then they will draw Normal Results. The normal range of 25-hydroxy vitamin D is measured as nanograms per milliliter (ng/mL). Many experts recommend a level between 20 and 40 ng/mL. Others recommend a level between 30 and 50 ng/mL. The examples above are common measurements for results of these tests. The FDA developed DVs to help consumers compare the nutrient contents of foods and dietary supplements within the context of a total diet. The DV for vitamin D is 20 mcg (800 IU) for adults and children age 4 years and older [ ]. Reference ranges for 1,25 (OH) 2 D may be reported as either pg/mL or pmol/L. The molecular weight of 1,25 (OH) 2 D is approximately 416.7, yielding the following conversion factors: 1 Normal Results. The normal range of 25-hydroxy vitamin D is measured as nanograms per milliliter (ng/mL). Many experts recommend a level between 20 and 40 ng/mL. Others recommend a level between 30 and 50 ng/mL. The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. .

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