Urine glucose test shows 3 plus urine glucose, blood glucose must be abnormal, random or fasting glucose test is needed to rule out the presence of diabetes. Usually the kidney metabolic threshold for sugar is 10 mmol/L. If the blood glucose level exceeds 10 mmol/L, a positive urine glucose result will occur and fasting glucose monitoring is required to confirm the diagnosis of diabetes mellitus. For urine sugar more than 3 plus, blood glucose level between about 10-15mmol/L, further testing is needed to confirm the diagnosis, and a routine urine test should be performed to find out if there are ketone bodies in the urine. For patients with high blood glucose can develop ketoacidosis, which causes a decrease in the pH of the urine, accompanied by a large amount of ketone bodies, and the patient can be in a state of dehydration, which can even cause coma in severe cases.