Paroxysmal nocturnal hemoglobinuria (PNH), a rare benign hematological disorder, presents with a wide variety of clinical symptoms. A direct Coombs-negative hemolytic anemia combined with an increased LDH = Lactate dehydrogenase level are signs to test for PNH. Follow-up does not need any microscopic review's only flow cytometric PNH clone size.
Keywords: Coombs‐negative hemolysis; Paroxysmal nocturnal hemoglobinuria; abdominal pain; flow cytometry; hemolytic anemia.