<prompt> GFR of a diabetic person is 90 mlmin. Blood glucose is 200 mgdl. Calculate urinary glucose excretion rate if the Tm for glucose is 150 mgmin20 mgmin30 mgmin40 mgmin50 mgmin  <response>: Amount of filtered glucose Plasma concentration of glucose X GFR 90 mlmin X 200 mg dl 180 mgmin Rate of excretion of Glucose Amount filtered - Tubular maximum Rate of excretion of Glucose 180 mgmin -150 mgmin 30 mgmin Ref : Ganong 25th edpage 681 