The reference range of the total 25 (OH)D level is 25-80 ng/mL. [ 1] The major circulating form of vitamin D is 25-hydroxyvitamin D (25 (OH)D); thus, the total serum 25 (OH)D level is currently considered the best indicator of vitamin D supply to the body from cutaneous synthesis and nutritional intake. The reference range of the total 25 (OH)D.. 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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A vitamin D test is used to screen for or monitor bone disorders. It is also sometimes used to check vitamin D levels in people with chronic illnesses such as asthma , psoriasis , and certain autoimmune diseases .. According to the Office of Dietary Supplements, the following are the average recommended amounts of vitamin D a person needs per day: Age. Amount. 0-12 months. 10 micrograms (mcg) or 400.