Alpha-1 antitrypsin (AAT) is a protein created in the liver which travels to your bloodstream. This protein protects your lungs and other organs from harmful irritants and infections. AAT deficiency, also referred to as Alpha-1, is a rare genetic condition that causes people to have low levels of AAT in their bloodstream.
This disorder can increase your chances of developing lung and liver diseases such as emphysema and cirrhosis. This is because the low AAT levels mean that the lungs are not protected, and the liver becomes damaged because the protein builds up in that area.