A 35 years old man Ramu has fasting and post prandial blood sugar within normal limit but urine sugar is 3 plus (+++). The diagnosis is –
## **Core Concept**
The question tests the understanding of **renal glycosuria**, a condition where glucose is present in the urine despite normal blood glucose levels. This condition arises due to a defect in the renal tubules' ability to reabsorb glucose.
## **Why the Correct Answer is Right**
The correct answer, **Renal glycosuria**, is right because it explains the presence of glucose in the urine (glycosuria) despite normal fasting and postprandial blood glucose levels. This condition is usually benign and results from a decreased threshold for glucose reabsorption in the proximal convoluted tubule of the kidney. The **SGLT2 (sodium-glucose cotransporter 2)** receptor plays a key role in glucose reabsorption in the kidneys.
## **Why Each Wrong Option is Incorrect**
- **Option A: Diabetes Mellitus** is incorrect because, in diabetes mellitus, blood glucose levels are elevated, which is not the case here.
- **Option B: Alimentary glycosuria** is incorrect because it is a transient condition related to carbohydrate intake and does not explain persistent glycosuria with normal blood glucose levels.
- **Option C: Stress-induced glycosuria** is incorrect as it is associated with stress, which can elevate blood glucose temporarily, not applicable in this scenario.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **renal glycosuria** is a benign condition and does not require treatment. It is diagnosed when blood glucose levels are normal, but urine glucose is positive. This condition can sometimes be confused with diabetes mellitus due to the presence of glycosuria.
## **Correct Answer:** . **Renal glycosuria**