what is normal range for potassium
1 It is also important for maintaining normal heart electrical rhythm and for normal electrical signals in the nervous system. 2  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 are considered to be mild hyperkalemia.