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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.
Normal plasma potassium levels are between 3.5 and 5.0 meq/l; about 98% of the body's potassium is found inside cells, with the remainder in the extracellular fluid including the blood. Alternately, the NIH denotes 3.7â5.2 meq/l as a normal range. A low level of magnesium in the blood can also cause hypokalemia. 2  Magnesium is required for adequate processing of potassium. 3  This may become evident when hypokalemia persists despite potassium supplementation. 4  Other electrolyte abnormalities may also be present.