− | The presence of glucose in the urine is termed glucosuria and occurs when the level of glucose reaches the [[Reabsorption and Secretion Along the Proximal Tubule - Anatomy & Physiology#Glucose|renal threshold]] for glucose reabsorption. It is not normal to find glucose in the urine. | + | The presence of glucose in the urine is termed glucosuria and occurs when the level of glucose reaches the [[Reabsorption and Secretion Along the Proximal Tubule - Anatomy & Physiology#Glucose|renal threshold]] for glucose reabsorption. It is not normal to find glucose in the urine. Glucose is usually not detectable because ketones, ascorbic acid, or other substances found in urine may cause false negative results by reagent strips even when urinary glucose approaches clearly abnormal values. |