. "It works with other electrolytes such as potassium, sodium, and carbon dioxide (CO2) to help keep the proper balance of body fluids and maintain the body's acid-base balance.This article discusses the laboratory test to measures the amount of chloride in the fluid portion (serum) of the blood.See also:Chloride in diet Chloride test - urine Sweat chloride test Urine electrolytes test Alternative Na" . . .