## **Core Concept**
The patient's symptoms and laboratory results indicate the presence of **glycosuria** (glucose in the urine) and **hyperglycemia** (elevated blood glucose levels). Benedict's test is a screening test for reducing sugars, which includes glucose. The results suggest **diabetes mellitus**, a metabolic disorder characterized by chronic hyperglycemia due to defects in insulin secretion, insulin action, or both.

## **Why the Correct Answer is Right**
The patient's **random blood sugar > 163 mg%** and **fasting blood sugar > 200 mg%** meet the diagnostic criteria for diabetes mellitus. According to the American Diabetes Association (ADA), a **fasting plasma glucose ≥ 126 mg/dL** or a **random plasma glucose ≥ 200 mg/dL** in a patient with classic symptoms of hyperglycemia (thirst, polyuria, weight loss) confirms the diagnosis. The next line of investigation would be to **confirm the diagnosis and assess the severity** of diabetes, which involves **Hemoglobin A1c (HbA1c) measurement**. HbA1c reflects the average blood glucose levels over the past 2-3 months and is a valuable tool for diagnosing diabetes and monitoring its control.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While imaging studies might be useful in assessing complications of diabetes, they are not the immediate next step after diagnosing hyperglycemia.
- **Option B:** Other tests might be relevant in the broader evaluation of the patient's health or in assessing for complications of diabetes, but they do not directly follow the detection of hyperglycemia and glycosuria.
- **Option C:** Although monitoring blood glucose levels is crucial, repeating the test is not considered the next line of investigation after confirming hyperglycemia.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that an **HbA1c level of ≥ 6.5%** is diagnostic of diabetes mellitus. This test is particularly useful because it provides a **long-term assessment of glycemic control**, helping to differentiate between **diabetes mellitus** and **stress-induced hyperglycemia** or **other conditions causing hyperglycemia**.

## **Correct Answer:** .