# Familial pseudohyperkalemia

INSERM

## Source

INSERM. (1999). Orphanet: an online rare disease and orphan drug data base. *Familial pseudohyperkalemia*. ORPHA:90044

Familial pseudohyperkalemia (FP) is an inherited, mild, non-hemolytic subtype of hereditary stomatocytosis that is associated with a temperature-dependent anomaly in red cell membrane permeability to potassium that leads to high in vitro potassium levels in samples stored below 37°C. FP is not associated with additional hematological abnormalities, although affected individuals may show some mild abnormalities like macrocytosis.