NBME 18

nbme18/Block 1/Question#38

45 yo homeless man found unconscious

Methylmalonic Acid: normal; Homocysteine: increased

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submitted by match95(3),

Question was tricky -- need to look ate FOLATE levels. Both B12 deficiency and folate deficiency will cause an increase in homocysteine. Only B12 deficiency will cause an increase in BOTH methylmalonic acid AND homocysteine.