CT Scan vs. Endoscopy: CT scans utilize X-rays to form images of organs and tissues inside the body (for example, abdominal organs, brain, chest, lungs, heart) while endoscopy is a procedure that can visualize only the inside surface of the upper gastrointestinal tract.

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CT Scan

What is a CT scan? Computerized tomography scans (CT scans) are important diagnostic tools for a variety of medical conditions. Some areas of the body frequently evaluated by CT scans include the brain, neck, spine, chest, abdomen, pelvis, and sinuses. The CT scan process uses X-rays and a computer to produce cross-sectional images of the body.
Gastrointestinal Endoscopy

With the procedure known as gastrointestinal endoscopy, a doctor is able to see the inside lining of your digestive tract. This examination is performed using an endoscope -- a flexible fiberoptic tube, usually with the patient under sedation.
What Does an Endoscopy Test For

An endoscopy is a catch-all term for a minimally invasive procedure using an endoscope (a long surgical tool with a camera at the end) to view the inside of the body, whether through an orifice to examine the digestive tract or urinary system, for example, or through an incision such as used for the inspection of a joint.

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Endoscopy With the procedure known as gastrointestinal endoscopy, a doctor is able to see the inside lining of your digestive tract. This examination is performed using an endoscope -- a flexible fiberoptic tube, usually with the patient under sedation.