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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.
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.