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Knowing potassium levels is the first step to investigating the cause of high potassium. Less than 3.5 mg/dL is low. Between 3.5 to 5.5 mg/dL is safe. 5.6 to 6.0 mg/dL is high and unsafe.
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.