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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.
Technically, hyperkalemia means an abnormally elevated level of potassium in the blood. The normal potassium level in the blood is 3.5-5.0 milliequivalents per liter (mEq/L). Potassium levels between 5.1 mEq/L to 6.0 mEq/L reflect mild hyperkalemia.ormal blood levels of potassium are critical for maintaining normal heart electrical rhythm. Both low blood potassium levels (hypokalemia) and high blood potassium levels (hyperkalemia) can lead to abnormal heart rhythms.