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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.
Low potassium (hypokalemia) refers to a lower than normal potassium level in your bloodstream. Potassium is a chemical (electrolyte) that is critical to the proper functioning of nerve and muscles cells, particularly heart muscle cells.Normally, your blood potassium level is 3.6 to 5.2 millimoles per liter (mmol/L).A very low potassium level (less than 2.5 mmol/L) can be life-threatening and requires urgent medical attention.ormally, your blood potassium level is 3.6 to 5.2 millimoles per liter (mmol/L). A very low potassium level (less than 2.5 mmol/L) can be life-threatening and requires urgent medical attention.