MCQ – 88833

Question

A 21-year-old woman is suspected of having mycoplasma pneumonia based on symptoms of a dry cough, fever, normal lung examination but abnormal chest x-ray with bilateral infiltrates. She is also anemic with hemoglobin of 10.5 g/dL, reticulocyte count of 7%, and WBC 12,000/mL. Hemolytic anemia from cold agglutinins is suspected as the cause. Which of the following tests will confirm autoimmune causation as the cause of the anemia?

A.

positive antinuclear antibody (ANA)

B.

positive rheumatoid factor

C.

polyclonal gammopathy

D.

positive Coombs’ test

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