<prompt> The gold standard Lab test for diagnosis of PNH Paroxysmal Nocturnal Hemoglobinuria is?Ham testHaptoglobinFlow cytometrySucrose Lysis test  <response>: 1.CD59 -It is also given the name ofMIRLMembrane Inhibitor of Reactive Lysis. 2.CD55 -It is given the name ofDAFDecay Accelerating Factor . It is responsible for breakdown ofC3. -Flow cytometry of RBC showing absence of CD55 and CD59 is gold standard diagnostic test for PNH. Other tests used are: Sucrose hemolysis test: patients whole blood is mixed with isotonic sucrose solution , which promotes binding of complement to red blood cells, then incubated and examined for hemolysis; greater than 10percent hemolysis indicates PNH Acidified serum Ham test: Acidification of serumactivates complement alternate pathway and causes haemolysis of red cells if they are abnormally sensitive to complement. 