If the patient has a urine test and there is a plus sign for ketone bodies but no diabetes, the condition is not harmful to the body. However, if the patient is diabetic, it may lead to dehydration, lower blood pressure, hyperkalemia, and acidosis, among others. Ketone bodies are a product of fat metabolism and are produced when a patient is starving and fat mobilization is enhanced. If the patient is in a state of fasting and starvation at the time of routine urinalysis, then a positive urine ketone body is very common, and this condition is not harmful to the body. If the patient has diabetes, impaired blood sugar application, and enhanced fat metabolism, and a positive urine ketone body is also found during a routine urinalysis, this condition is usually accompanied by more pronounced dehydration, hyperkalemia, acidosis, etc. These conditions may endanger the patient’s life. Therefore, when a positive urine ketone body is found, the first thing to review is whether the urine routine was checked in a state of starvation, followed by a blood glucose test to rule out the possibility of diabetes.