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At our laboratory we currently offer a test profile of vitamin B12, serum folate and red cell folate. Red cell folate is generally considered to be a better test than serum folate. My question is: Is there good clinical evidence that red cell folate outperforms serum folate in positive and negative predictive values ? \/ \/ \/ \/ \/ \/ \/ /\____/\____/\____/\____/\____/\____/\____ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%