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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.
Doctors do this test as part of a routine physical or to diagnose or monitor kidney disease. The normal range for the acceptable potassium level varies slightly between different laboratories, but the National Institutes of Health report it as 3.7 to 5.2 milliequivalent per liter.