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Bronchoalveolar lavage (BAL) has been used in diagnostic and prognostic evaluation in diffuse parenchymal lung disease for three decades and has a central role in the diagnosis of a number of rare disorders and in excluding opportunistic infection in treated patients. It also has an important place in the personal diagnostic algorithms of many experienced clinicians in the diagnosis of the more prevalent disorders, including sarcoidosis, hypersensitivity pneumonitis and idiopathic pulmonarydoi:10.1183/09059180.00005510 pmid:20956199 fatcat:h7zpucfh5zetrcmsaum62qndve