Researchers have developed a novel method to test for vitamin B12 deficiency that is sensitive enough to work on anyone, including newborn babies and large swaths of the general population. The research took place at the University of British Columbia. Vitamin B12 deficiency can be tested with a single drop of blood collected from a finger prick, then blotted and dried overnight on a card consisting of filter paper. The UBC study made dried blood spot card analysis ...
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