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25-hydroxyvitamin D (25(OH)D) is the major circulating form of vitamin D and has a fairly long circulating half-life of 15 days; 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 nu tritional intake. In medicine, a 25hydroxyvitamin D blood test is used to determine how much vitamin D is in the body. The blood concentration of 25 hydroxyvitamin D is considered the best indicator of vitamin D status.
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