With diabetes, something goes wrong. This is called insulin resistance . So, instead, glucose builds up in the blood. Picture blood the thickness of maple syrup, and you can understand why everything slows down and sticks together. Testing your urine for glucose is not a good way to know if you have too much glucose in your blood.
Blood testing is much more exact.
Right now, there is no cure for diabetes. But someone with diabetes can stay healthy if blood glucose levels are kept near normal. Because, even without signs, high glucose levels are harmful. A healthy life in the future depends on good blood glucose levels now. No More Black and White by Faith Thibodeau, MS, RD, LD, CDE February 2000 Definitions Carbohydrate.