If a patient is vomiting blood, what diagnostic procedure should be performed?

• A. Upper gastrointestinal series
• B. CT scan of the abdomen
• C. EGD
• D. Colonoscopy

Answer: (C)

When a patient presents with vomiting blood, also known as hematemesis, the most appropriate diagnostic procedure is an esophagogastroduodenoscopy (EGD). This procedure allows direct visualization of the upper gastrointestinal tract, including the esophagus, stomach, and the beginning of the duodenum. During an EGD, the clinician can identify potential sources of bleeding such as peptic ulcers, varices, or erosive gastritis, and can also take biopsies or perform therapeutic interventions if necessary.

The other options are less appropriate for an acute setting where hematemesis is present. An upper gastrointestinal series, although useful for assessing structural abnormalities in the upper GI tract, is not as immediate or as effective for identifying active bleeding compared to EGD. A CT scan of the abdomen is generally more useful for evaluating abdominal pain or trauma, while colonoscopy is primarily used for examining the colon and is not indicated for bleeding originating from the upper GI tract.

Thus, the use of EGD in this case is vital for both diagnosis and management of the patient's condition in a prompt and effective manner.