The body requires the presence of certain ions that can deliver its functions at the cellular level correctly. Kalium potassium or is a cation which is located inside cells (intracellular) in 98% of cases and only 2% is outside. This distribution is necessary for muscles and nervous system working properly. The concentration of potassium in the blood is called kalemia and normal values range between 3.5 - 5.0 mEq / liter. Hypokalemia is decreasing concentration below 3.5 mEq / liter.