Electrolyte testing is used primarily in critically ill patients or after complex surgeries to help minimize perioperative complications and to monitor postoperative status. If the electrolytes report abnormal values, they can be corrected with appropriate medications. The electrolytes in the blood mainly include sodium, potassium, magnesium, calcium, and phosphorus, which all have certain concentration requirements in the body, so blood tests are performed to check these electrolytes to determine whether metabolic disorders have occurred in these electrolytes. The checking of electrolytes can help the patient to minimize the occurrence of perioperative complications. If electrolytes are abnormal, appropriate medication should be given promptly to reduce discomfort, such as the diuretic furosemide to correct hyperkalemia. Some serious electrolyte disorders, such as severe hyperkalemia and hypercalcemia, should be corrected in a race against time to prevent fatal injury. Postoperative patients need regular electrolyte review to promote a speedy recovery. When abnormalities appear in the patient’s examination, diagnosis and treatment should be carried out by a specialized doctor who integrates the patient’s symptoms.