The normal range of blood potassium values is 3.5 mmol/L to 5.5 mmol/L. A blood potassium level below 3.5 mmol/L is called hypokalemia. Hypokalemia can be seen in patients with alkalosis, prolonged use of diuretics, chronic alkalosis, and diarrhea. In case of low potassium, potassium-rich foods such as oranges and soybeans should be consumed. For severe potassium deficiency, use potassium chloride and potassium citrate as prescribed by the doctor. A blood potassium level above 5.5 mmol/L is called hyperkalemia. Hyperkalemia can be seen in patients with acute and chronic renal insufficiency, metabolic acidosis, epilepsy and shock. A blood potassium level below 2.8 mmol/L or above 6.5 mmol/L is a dangerous value for potassium and carries a risk of cardiac arrest. Patients who find abnormalities in blood potassium must go to the hospital in time to avoid delays.