to check potassium levels if you have been vomiting, have had diarrhea for several hours or days, or show signs of dehydration
to confirm hyperkalemia or hypokalemia
to diagnose a kidney disease or injury, such as medullary cystic kidney disease
to diagnose adrenal gland problems, such as hypoaldosteronism and Conn’s syndrome
to verify a low or high blood potassium test result
to monitor possible side effects of medications or drug treatments