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By Dr Ananya Mandal, MD. Electrolytes are essential substances in the body required for cell function and cell signalling. In the human body, the main electrolytes are: 1  Sodium (Na+). 2  Potassium (K+). 3  Calcium (Ca2+). 4  Magnesium (Mg2+). 5  Chloride (Clâ). 6  Hydrogen phosphate (HPO42â). 7  Hydrogen carbonate (HCO3â).
This test measures the main electrolytes in your body: sodium, chloride, potassium, and carbon dioxide. The cells in your body carefully balance fluids and electrolytes, which are electrically charged minerals.Electrolytes move fluid in and out of your cells.They carry nutrients into the cells and waste products back out. Electrolytes also help keep your water level normal and your pH level stable.he cells in your body carefully balance fluids and electrolytes, which are electrically charged minerals. Electrolytes move fluid in and out of your cells. They carry nutrients into the cells and waste products back out. Electrolytes also help keep your water level normal and your pH level stable.