Common diagnostic tests include endoscopies (such as gastroscopy and colonoscopy), imaging studies (CT scans, MRI, and ultrasound), and various laboratory tests to evaluate liver function, infection, or inflammation.

An endoscopy is a procedure that uses a flexible tube with a camera (endoscope) to view the inside of the digestive tract. It is used to diagnose and sometimes treat conditions like ulcers, inflammation, and tumors, and to take biopsies for further examination.

Yes, preparations vary depending on the procedure. For example, a colonoscopy requires bowel cleansing, while fasting may be necessary before an endoscopy. The healthcare team will provide detailed instructions.