Background: Bronchoalveolar lavage (BAL) is essential in determining the efficacy of novel therapies in alpha-1 antitrypsin deficiency (AATD). These require initial proof-of-concept demonstration that treatment administration increases alpha-1 antitrypsin (AAT) levels and/or anti-neutrophil elastase inhibitory capacity (ANEC) in the lung. Early-phase studies often encounter high interindividual variability of BAL results, primarily stemming from the inherent dilution characteristics of returned BAL fluid.
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