Vitamin B12
Neurology Board Preparation
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Myelopathies, Multiple Sclerosis, & ALS
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Nutritional Deficiencies
Q. A 45-year-old man with chronic pancreatitis presents with fatigue and glossitis. Lab studies show macrocytosis, elevated homocysteine, and elevated methylmalonic acid. Which of the following best explains his vitamin deficiency?
a
Loss of intrinsic factor production
b
Failure of R factor cleavage in the duodenum
c
Failure of ileal absorption
d
Consumption of B12 by intestinal bacteria
e
Loss of dietary intake of animal products
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