Paroxysmal Cold Hemoglobinuria: Diagnosis From the Blood Smear

Phagocytosis of red cells by neutrophils, referred to as neutrophil erythrophagocytosis, on the blood smear as a helpful diagnostic sign of paroxysmal cold hemoglobinuria is underrecognized. We present a child with paroxysmal cold hemoglobinuria and prominent neutrophil erythrophagocytosis to highlight the importance of this finding in the diagnosis of paroxysmal cold hemoglobinuria.