The<unk>  is a blood test used in the diagnosis of paroxysmal nocturnal hemoglobinuria (PNH). Patient red blood cells (RBCs) are placed in mild acid; a positive result (increased RBC fragility) indicates PNH or congenital dyserythropoietic anemia. This is now an obsolete test for diagnosing PNH due to its low sensitivity and specificity.<unk> 's test is occasionally positive in aplastic anemia.
Ham test
Czermak–Hering test
Conconi test
Ames test
Nardi test
Elek's test
Yeoman's test
Buehler test