Hyperkalemia is defined as a serum or plasma potassium level above the upper limits of normal, usually greater than 5.0 mEq/L to 5.5 mEq/L. While mild hyperkalemia is usually asymptomatic, high levels of potassium may cause life-threatening cardiac arrhythmias, muscle weakness, or paralysis.⁠ ⁠ True hyperkalemia may be caused by increased potassium intake, transcellular movement of intracellular potassium into the extracellular space, and decreased renal excretion.⁠