Reader Question: I recently had my vitamin D level checked and was told it was fine. Now I'm hearing that the test might have been inaccurate. What should I believe?
Quest Diagnostics, the largest commercial lab in the U.S., recently revealed that they've had some problems with vitamin D tests and that about 10% of those done between 2007 and mid 2008 could be wrong. (Quest says people may have been told their vitamin D level was higher than it actually was.) This error comes during a time when the number of vitamin D tests requested by physicians skyrocketed in response to a plethora of new studies about the importance of vitamin D.
Quest says that they have since gotten their act together and that the problem has been resolved. They're also offering free repeat testing to those affected, so if you got your test in 2007 or 2008, ask your doctor if you should be retested.
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