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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.
Potassium level The normal level is 3.5-5.0 mEq/L. Low potassium is defined as a potassium level below 3.5 mEq/L. Almost 1 out of 5 people hospitalized in the United States have a low potassium level. Up to 14% of people otherwise seen in doctors' offices have slightly low potassium levels.