Hyperkalemia (hyperkalaemia in British English, hyper- high; kalium, potassium; -emia, "in the blood") refers to the condition in which the concentration of the electrolyte potassium (K+) in the blood is elevated. Extreme hyperkalemia is a medical emergency due to the risk of potentially fatal abnormal heart rhythms (arrhythmia).
Normal serum potassium levels are between 3.5 and 5.0 mEq/L; at least 95% of the body's potassium is found inside cells, with the remainder in the blood. This concentration
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