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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.
Low Levels of Potassium. Potassium levels are checked through a blood test. According to the Cleveland Clinic, the normal potassium level for an adult is 3.5 to 5.0 mmol/L. A deficiency in potassium, called hypokalemia, can cause symptoms of weakness, muscle cramps, stomach problems, constipation, lack of energy and an abnormal heartbeat.