Familial pseudohyperkalemia

Familial pseudohyperkalaemia (PSHK) is an autosomal dominant red cell trait characterized by increased serum potassium in whole blood stored at or below room temperature, as a result of a temperature-based abnormality in the transport of potassium across the red cell membrane. PSHK is not accompanied by clinical symptoms or biological signs except for borderline abnormalities of red cell shape.