This simple test can give your doctor more information about your health when other tests, like blood potassium tests or kidney function tests, show a problem.
Potassium is a type of mineral called an electrolyte that helps your cells and organs work. Your body needs it to digest food, keep your heart beating right, and many other activities. You get most of your potassium from foods. Your body uses what it needs, and your kidneys put the rest into your urine as waste.