Adenosine Triphosphate, Elevated, of Erythrocytes, also known as pyruvate kinase hyperactivity, is related to pyruvate kinase deficiency of red cells and hemolytic anemia. An important gene associated with Adenosine Triphosphate, Elevated, of Erythrocytes is PKLR (Pyruvate Kinase L/R). Related phenotypes are polycythemia and reduced erythrocyte 2,3-diphosphoglycerate concentration