what is antitrypsin
Alpha-1 antitrypsin (an-tee-TRIP-sin) deficiency, or AAT deficiency, is a condition that raises your risk for lung disease (especially if you smoke) and other diseases.Some people who have severe AAT deficiency develop emphysema (em-fi-SE-ma)âoften when they're only in their forties or fifties.lpha-1 antitrypsin, also called AAT, is a protein made in the liver. Normally, the protein travels through the bloodstream. It helps protect the body's organs from the harmful effects of other proteins.