The nation's largest medical-laboratory company provided possibly erroneous results to thousands of people who had their vitamin-D levels tested in the past two years, the company has acknowledged.
The company, Quest Diagnostics, has already sent letters to thousands of doctors listing the patients who might have received "questionable" test results and is offering free retests. An erroneously high result may mean that patients will not take vitamin-D supplements when perhaps they should, doctors said, and an erroneously low test result might lead in rare instances to a toxic overdose.
Quest's action is "the largest patient test recall I'm aware of in my 20 years in the business," said Robert L. Michel, the editor of The Dark Report, a newsletter for pathologists.
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