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Pathology
A 49-year-old female presents with signs of anemia and states that every morning her urine is dark. Workup reveals that her red blood cells lyse in vitro with acid (positive Ham's test). What is the best diagnosis for this patient?
Warm autoimmune hemolytic anemia
Paroxysmal nocturnal hemoglobinuria
Paroxysmal cold hemoglobinuria
Cold-agglutinin autoimmune hemolytic anemia
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