What is the role of quantitative serum alpha1-antitrypsin (AAT) levels in the diagnosis of bronchiectasis?

Updated: Jul 23, 2019
  • Author: Ethan E Emmons, MD; Chief Editor: Zab Mosenifar, MD, FACP, FCCP  more...
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Quantitative serum alpha1-antitrypsin (AAT) levels are used to rule out AAT deficiency. In addition to a suggestive family history, clinical features of emphysema that suggest the possibility of AAT deficiency and the need for serum testing include onset at an early age (45 y or less) and the absence of a recognized risk factor (eg, smoking, occupational dust exposure).

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