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Vitamin D Testing

Analytical & Clinical Conundrums



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Summary

Slide 26

January 2009

In summary, three different forms of vitamin D exist in human circulation, but 25-hydroxy vitamin D is the recommended marker for determining vitamin D deficiency. Various formats of 25-hydroxy vitamin D assays are available. A lot of literature has been published describing the strengths and weaknesses of those assays. 1,25-dihydroxy vitamin D should be ordered only in rare situations like renal failure or sarcoidosis and should be interpreted only with the help of specialized doctors.

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