A (+) sign of glucose found in the urine test may indicate that the venous blood glucose has exceeded the normal range, but a (+) sign of urine glucose does not serve as a diagnostic criterion for whether diabetes is diabetes, but mainly depends on the high or low level of venous blood glucose. It is recommended that the patient go to the hospital to have blood drawn to determine the venous blood glucose and decide whether the diagnosis of diabetes has been reached according to the blood glucose level, and then the clinician will give rationalized advice according to this result. In another special case, when renal lesions cause a lowering of the renal glucose threshold, patients with normal venous blood glucose levels may also have a urine glucose (+) number, and patients with a urine glucose (+) number should still have venous blood drawn to clarify whether there are abnormalities in blood glucose metabolism.