Potassium, PT failure, Hb—more to troubleshoot
November 2025—A 24-year-old female with hereditary stomatocytosis presented with a critical potassium concentration of 7.9 mmol/L. Despite ruling out common causes like hemolysis and EDTA contamination, the elevated potassium persisted, leading to a diagnosis of a PIEZ01 mutation causing potassium leakage.