Bronchoalveolar lavage is performed during flexible bronchoscopy where it indeed possess high importance due to the information it conveys about the immunologic, inflammatory, and infectious processes at the alveolar level all in all. It is highly used to study and sort out any of the prevailing lung diseases as well as infections at that particular time and also study the functioning of the patient’s respiratory system. Though there are many methods available for such issues, BAL method has got a lot of recognition due to the efficiency and the effectiveness of the test results on the whole.