What is the difference between blood sugar and urine sugar?

Blood glucose is the glucose concentration in the blood, urine glucose is the glucose concentration in the urine. In general, most of the glucose in the urine is reabsorbed by the renal tubules. When the blood glucose concentration exceeds the maximum capacity of the renal tubules, it is also called the renal glucose threshold. However, the renal glucose threshold is affected by many factors, such as chronic kidney disease and pregnancy. Therefore, it shows false positives or false negatives. Urine glucose can not accurately reflect the glucose concentration in the body, only through the venous blood plasma glucose can accurately reflect the glucose concentration in the body.