Alveolar lavage fluids, also known as bronchoalveolar lavage (BAL) fluids, refer to the liquid obtained through a medical procedure called alveolar lavage. This procedure involves flushing the lung's air sacs, known as alveoli, with saline solution and then collecting the fluid for analysis. Several synonyms can be used to describe these fluids. Some alternative terms include "pulmonary lavage fluid", "lung lavage fluid", or simply "alveolar fluid". These synonyms are commonly employed in medical research and literature to reference the fluid collected during alveolar lavage, facilitating a better understanding of respiratory conditions and aiding in diagnosis and management.