A laboratory result that would suggest a PK deficiency on a 20-year-old patient is/are?

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PK (Pyruvate Kinase) deficiency is a rare cause of chronic nonspherocytic hemolytic anemia. The characteristics of PK deficiency include a negative DAT (direct antiglobulin test), indicating that the hemolysis is not immune-mediated; an abnormal autohemolysis test that is not corrected by the addition of glucose, reflecting the underlying metabolic defect in the red blood cells; and a normal osmotic fragility test in freshly drawn blood, as the hemolysis is not due to membrane fragility but rather to an enzymatic defect in the glycolytic pathway.

A Laboratory Result That Would Suggest a PK Deficiency on a 20-Year-Old