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Vitamin D testing standards
Robert from Florida writes:
Dr. Cannell: I understand the federal government is going to come out with some new standards for Vitamin D testing. What are they?
Dr. Cannell replies:
Actually, the National Institute of Standards and Technology (NIST) are coming out with standards that were supposed to allow reference laboratories to check the accuracy of their Vitamin D techniques. Unfortunately, NIST's standards dilute with horse serum for their low samples and spike (adding extra 25(OH)D) for their high standards and that will cause problems for some measurement techniques. It is unclear how the big reference labs will compensate for NIST's procedures.
Page last edited: 08 November 2010
