What is a biopsy?

A biopsy is defined as the removal and examination of tissue from a living body to diagnose a disease, particularly cancer. This procedure allows medical professionals to closely inspect cells in the tissue sample, helping to identify abnormalities or confirm the presence of disease. Biopsies can be performed using various methods, such as needle aspiration, excisional biopsies, and endoscopic biopsies, depending on the location and type of tissue being examined. The importance of a biopsy lies in its ability to provide vital information about a patient's health, guiding further treatment and management.

The other options refer to different medical practices: measuring blood pressure is a vital sign assessment, analyzing blood sugar levels pertains to testing for diabetes and related conditions, and physical therapy focuses on rehabilitation through exercise and movement. All these practices serve different purposes and are not synonymous with a biopsy.