<prompt> Which of the following is the best test for diagnosis of paroxysmal nocturnal hemoglobinuria?Sucrose lysis testHam testFlow cytometryBone marrow aspiration  <response>: - Best investigation for diagnosing PNH - Flaer flow cytometry - Biphenotypic cells are seen - Other investigations used are: Hams acidified serum test Sucrose lysis test 