Four important ones are sodium, potassium, chloride, and carbon dioxide. Their levels are measured in the electrolyte test. Sodium and chloride are important in determining if your kidneys are working correctly. Sodium is important because a high sodium level may cause high blood pressure in some people. Table salt is sodium chloride, which is why people with high blood pressure sometimes are put on a low-sodium diet.
Potassium is important for proper heart function.
People taking diuretics tend to lose potassium, so your doctor orders a potassium test to make sure you have enough potassium. People with a low potassium may have leg cramps. People with lung problems may have a high CO2 level. It is not a substitute for professional care. If you have, or suspect you may have a health problem, you should consult your healthcare provider.