BRONCHOALVEOLAR LAVAGE Subject : Science & tech Context : A number of symptomatic patients who tested false negative in RT-PCR assays have subsequently been confirmed Covid-positive in Bronchoalveolar Lavage (BAL) tests. Concept : Bronchoalveolar lavage (BAL) (also known as bronchoalveolar washing) is a diagnostic method of the lower respiratory system in which a […]