Reporting by Nancy Lapid; Editing by Bill BerkrotOur Standards: The Thomson Reuters Trust Principles. A study published on Tuesday in PLoS Medicine suggests that boosting vitamin D levels with supplements would not help. Pool testing allows scientists to test samples more efficiently, analyzing many samples at once. In a study conducted for the National Institutes of Health, researchers tested nearly 18,000 "minipools" of blood samples  that is, blood samples pooled from total of roughly 258,000 donors from across the country. The analysis pooled together 54 studies with a total of 77,758 participants.
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