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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.
When potassium levels are low (hypokalemia), you can become weak as cellular processes are impaired. 1  The normal potassium level is 3.5-5.0 mEq/L (mEq/L stand for milliequivalents per liter of blood and this is a unit measure used to evaluate the level). Low potassium is defined as a potassium level below 3.5 mEq/L. Almost one out of five people hospitalized in the United States has a low potassium level.