According to the results of glucose tolerance test, the patient has no disorder of carbohydrate tolerance. Despite that, glucose is detected in the patients's urine (5 mmol/l). The patient has been diagnosed with renal diabetes. What renal changes cause glucosuria in this case?

Answer options

1. Increased activity of glucose reabsorption enzymes
2. Decreased activity of glucose reabsorption enzymes
3. Increased glucose secretion
4. Increased glucose filtration
5. Exceeded glucose reabsorption threshold

Explanation

The problem here is glucose wasn’t reabsorbed along with Na because Sodium-glucose transport (SGLT) enzymes activity is reduced.