Paroxysmal nocturnal hemoglobinuria (PNH) affects your bone marrow, where your body makes new blood cells. ... This is the most accurate way to diagnose PNH. This test uses a sample of your blood.

Paroxysmal nocturnal hemoglobinuria (PNH) is a rare disease that affects red blood cells, causing symptoms like dark urine, ...

Paroxysmal nocturnal hemoglobinuria (PNH) is marked by the vulnerability of red blood cells to attack. The lack of protective proteins on PNH cells is the result of a difference in the PIGA gene.