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The 25-hydroxy vitamin D test is the most accurate measure of the amount of vitamin D in the body.In the kidney, 25-hydroxy vitamin D changes into an active form (called 1,25-dihydroxy vitamin D). The active form helps control blood levels of calcium and phosphate.This article discusses the blood test used to measure the amount of 25-hydroxy vitamin D.
Review Date: 7/17/2007

The 25-hydroxy vitamin D test is the most accurate way to measure how much vitamin D is in your body.In the kidney, 25-hydroxy vitamin D changes into an active form of the vitamin. The active form of vitamin D helps control calcium and phosphate levels in the body.This article discusses the blood test used to measure the amount of 25-hydroxy vitamin D.
Review Date: 7/28/2008

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