What is the role of biopsy forceps in flexible endoscopy?

The primary role of biopsy forceps in flexible endoscopy is to obtain tissue samples for histological examination. When a clinician suspects the presence of abnormal or diseased tissue during an endoscopic procedure, biopsy forceps are used to grasp a small piece of tissue from the suspicious area. This tissue is then sent to a pathology lab, where it undergoes microscopic analysis to diagnose conditions such as cancer, infections, or inflammatory diseases. The ability to collect tissue samples accurately and safely during endoscopy is crucial for effective diagnosis and subsequent treatment planning.

The other options describe different procedures and tools used in endoscopy. Removing polyps from the colon typically involves specialized snare devices or polypectomy tools rather than biopsy forceps, which are meant for tissue sampling. Injecting fluids into the stomach is a function related to therapeutic endoscopic procedures and does not involve biopsy forceps. Expanding the esophagus is achieved using dilators or balloons specifically designed for that purpose, not through the use of biopsy forceps. Thus, the correct focus of biopsy forceps is their intended use for obtaining tissue samples for further examination.