Glucosuria

This is a phenomenon when saccharides, usually glucose, are found in the urine. Glucose is not found in the urine of a healthy person. Glucose in the blood, along with ions, urea, and amino acids, enters the filtrate formed in the renal corpuscles. Glucose reabsorption occurs in the distal renal tubules. If the glucose concentration in the blood does not exceed the renal threshold value (7–10 mmol/l), all the glucose present in the filtrate of the distal renal tubules is returned to the blood. When the glucose concentration in the blood exceeds the specified threshold, the capacity of glucose reabsorption is not sufficient to return all the glucose in the filtrate back to the blood, so it is excreted in the urine. Due to glucosuria, water is also lost, leading to dehydration in the body, a process known as osmotic diuresis.

Source | Glossary of Most Commonly Used Biomedical Terms and Concepts | Lithuanian University of Health Sciences | Academician Professor Antanas Praškevičius, Professor Laima Ivanovienė