A flow cytometry test is considered the gold standard for diagnosing PNH. This blood test can separate and analyze various components of blood. It reveals whether two key proteins, CD55 and CD59 ...

Paroxysmal nocturnal hemoglobinuria (PNH ... The key diagnostic tool is flow cytometry, which detects the absence of certain proteins (CD55 and CD59) on RBCs linked to PIGA gene mutation.