Why is it that people with normal urine glucose test may also be diabetic?

There are several possibilities: 1, a person who eats too much sugar at a time may temporarily exceed the threshold of diabetes, that is,120g/ml; 2, such as glomerular or renal capsule lesions, the ability to reabsorb sugar decreased. So high urine sugar content is not necessarily diabetes.

On the other hand, diabetes refers to islet B cell disease, which cannot produce insulin to lower blood sugar. There seems to be no saying that "people with normal urine sugar test may also be diabetic".