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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.
Hyperkalemia is the medical term that describes a potassium level in your blood that's higher than normal. Potassium is a nutrient that is critical to the function of nerve and muscle cells, including those in your heart. Your blood potassium level is normally 3.6 to 5.2 millimoles per liter (mmol/L). Having a blood potassium level higher than 7.0 mmol/L can be dangerous and requires immediate treatment. Causes.