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2734 Medicine

A 65-year-old man develops the onset of severe right knee pain over 24 hours. The knee is red, swollen, and tender. The patient does not have fever or systemic symptoms; he has never had severe joint pain before. Plain film of the knee shows linear calcification of the articular cartilage without destructive change. Definitive diagnosis is best made by which of the following?

ASerum uric acid
BSerum calcium
CArthrocentesis and identification of positively birefringent rhomboid crystals
DRheumatoid factor
Medicine
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2736 Medicine

Which of the following statements regarding the schilling test for vitamin B|2 malabsorption is most accurate?

AThe schilling test results are abnormal in patients with dietary vitamin B,,deficiency
BIn patients with pernicious anemia, the results of the schilling test normalize after oral administration of intrinsic factor
CIn patients with ileal disease, the results of the schilling test normalize after oral administration of intrinsic factor
DPancreatic exocrine insufficiency does not cause schilling test results to be abnormal
Medicine
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