What is a gastroscope primarily used for?

A gastroscope is specifically designed for examining the stomach. It is an essential tool in flexible endoscopy that allows medical professionals to visualize the inner lining of the stomach for diagnostic purposes, such as identifying ulcers, tumors, and other abnormalities. By utilizing a gastroscope, clinicians can also perform therapeutic procedures, such as biopsy collection or removal of polyps, directly during the examination, which enhances both diagnostic and therapeutic capabilities.

The other options pertain to different areas of the gastrointestinal tract that require different types of endoscopes. For instance, viewing the large intestine would typically involve a colonoscope, while inspecting the rectum requires a specialized scope such as a sigmoidoscope or rigid proctoscope. Observing the small intestine often involves the use of an enteroscope or capsule endoscopy. Each of these devices is tailored for specific regions, highlighting the gastroscope's unique role in stomach examination.