<prompt> Which of the following is the most probable diagnosis in a 35 years old man whose fasting and his post prandial blood sugar are within normal limits but urine sugar is three plus ?Renal glycosuriaPancreatic insufficiencyAlimentary glycosuriaHigh carbohydrate diet taken in the morning.  <response>: Renal Glycosuria Exp. DD of glycosuria: When glycosuria is found, it should be determined whether it is secondary to hyperglycemia DM or renal glycosuria. Glycosuria occurs when blood glucose level exceeds the renal glucose threshold threshold of 180 mg dl. Nondiabetic melituria occurs in a number of conditions, the most impoant being renal glycosuria and alimentary lag storageglycosuria. Renal glycosuria- diagnosis is based on the marbels criteria. Glycosuria in the absence of hypeeglycemia Constant glycosuria with little fluctuation related to diet Normal oral glucose tolerance test Identification of urinary reducing substance as glucose Normal storage and utilization of carbohydrates Alimentary lag storage glycosuria: Here there is a transient abnormal rise in blood glucose level following a meal, and the concentration exceeds the normal renal threshold. During this time, gloucose spills into the urine. This may occur in the following conditions: Following gastric surgery with rapid gastric emptying time Same normal people Hypehyroidism Hepatic diseases 