A lung biopsy is a medical procedure used to remove a small sample of lung tissue for examination. This test helps doctors diagnose conditions such as lung cancer, infections, or other lung diseases. The sample is usually analyzed under a microscope to identify any abnormalities. There are different methods for performing a lung biopsy, including bronchoscopy, where a thin tube is inserted through the mouth or nose into the lungs, and needle biopsy, where a needle is used to extract tissue from the lung. The choice of method depends on the patient's condition and the location of the tissue to be sampled.