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 patients go to the hospital to have their blood drawn to determine the venous blood glucose, and then the clinician will give rationalized advice based on the blood glucose level to determine whether the diagnosis of diabetes has been met. In some special cases, such as pregnancy or when kidney lesions cause a lowering of the renal glucose threshold, patients with normal venous glucose levels may also have a (+) urine glucose, and patients with a (+) urine glucose should still have venous blood drawn to clarify whether there are abnormalities in glucose metabolism.