## **Core Concept**
The core concept here revolves around the assessment and management of blunt abdominal trauma in a hemodynamically stable patient. The primary goal is to identify potential injuries that may require intervention. Imaging plays a critical role in this evaluation.

## **Why the Correct Answer is Right**
The correct answer, , is the best investigation because **Focused Assessment with Sonography for Trauma (FAST)** is a quick, bedside ultrasound examination that can help identify free intraperitoneal fluid (often blood) in hemodynamically unstable patients. However, in a **hemodynamically stable** patient, the best next step often involves more detailed imaging to assess for specific organ injuries. Among the options provided, **CT abdomen with contrast** is typically considered the gold standard for evaluating stable patients with suspected blunt abdominal trauma. It provides detailed images of the solid organs (liver, spleen, kidneys), hollow viscus, and vascular structures, helping to guide management.

## **Why Each Wrong Option is Incorrect**
- **Option A:** is incorrect because while FAST can quickly identify free fluid, it is less sensitive and specific than CT scanning for detecting specific organ injuries.
- **Option B:** is incorrect as it does not specify the modality and is less commonly used in this context compared to CT.
- **Option C:** might seem plausible but is not as commonly used or as informative as CT in the acute setting for blunt trauma.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **CT abdomen with contrast is the imaging modality of choice** for hemodynamically stable patients with suspected blunt abdominal trauma. It helps in identifying injuries that may require surgical or non-surgical intervention.

## **Correct Answer:** . CT abdomen with contrast