normal range for potassium levels
1 The normal potassium level in the blood is 3.5-5.0 milliEquivalents per liter (mEq/L). 2  Potassium levels between 5.1 mEq/L to 6.0 mEq/L are considered to be mild hyperkalemia. 3  Potassium levels of 6.1 mEq/L to 7.0 mEq/L are moderate hyperkalemia, and levels above 7 mEq/L reflect s evere hyperkalemia.t is also important for maintaining normal heart electrical rhythm and for normal electrical signals in the nervous system. 1  The normal potassium level in the blood is 3.5-5.0 milliEquivalents per liter (mEq/L).