Why is there no glucose in secondary urine?

In the secondary urine, in addition to water, there is a large amount of unnecessary and even harmful substances for the body, which are removed from the blood. Glucose is an organic substance that the body needs. It serves as a source of energy for most living organisms. During oxidation, glucose provides a large amount of energy, which is needed for various processes in cells. Because of this, glucose is not excreted from the body, as it is fuel for us and for most animals. Although there is still glucose in the primary urine.