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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
Review Date:
5/10/2006
Review Date:
8/21/2006
Review Date:
5/10/2006
Review Date:
10/24/2006
5-HIAA is a test that measures the amount of 5-hydroxyindoleacetic acid (5-HIAA) -- a break-down product of the chemical messenger serotonin -- in urine. This test tells how much 5-HIAA the body is removing.
Review Date:
3/22/2007
5'-nucleotidase (5'-NT) is a protein produced by the liver. A test can be done to measure the amount of this protein in your blood.
Review Date:
10/15/2007
Review Date:
5/10/2006