A pulmonary biopsy is a medical procedure used to obtain a small sample of lung tissue for examination. This test helps doctors diagnose various lung conditions, including infections, tumors, and interstitial lung diseases. The sample can be collected using different methods, such as a bronchoscopy, needle biopsy, or surgical biopsy, depending on the location and nature of the suspected issue. After the tissue sample is collected, it is sent to a laboratory where a pathologist examines it under a microscope. The results can provide crucial information about the presence of diseases like lung cancer, pneumonia, or pulmonary fibrosis, guiding treatment decisions.