Image Based Question – 74609

Following is the graph showing renal tubular transport maxima for glucose excretion in a diabetic patient. What will be the urinary glucose in a patient with a Mood sugar of 200 mg/dL and a glomerular filtration rate of 90 mL/min?

A. 20 mg/min

B. 30 mg/min

C. 60 mg/min

D. 100 mg/min

Correct Answer » B Explanation

Answer- B. 30 mg/min

• Refers to the point at which increase in tubular concentration of a substance does not result in an increase in tubular reabsorption due to saturation of ion channels
• Quantity of a substance excreted = (filtration + secretion)-reabsorption