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Hyperkalemia is defined as a serum potassium concentration greater than the upper limit of the normal range. The range in children and infants is age-dependent, whereas the range for adults is approximately 3.5-5.5 mEq/L.
Normal plasma potassium levels are between 3.5 and 5.0 meq/l; about 98% of the body's potassium is found inside cells, with the remainder in the extracellular fluid including the blood. Alternately, the NIH denotes 3.7â5.2 meq/l as a normal range. A low level of magnesium in the blood can also cause hypokalemia. 2  Magnesium is required for adequate processing of potassium. 3  This may become evident when hypokalemia persists despite potassium supplementation. 4  Other electrolyte abnormalities may also be present.