Alpha-1 Antitrypsin (Serum) Mass Concentration

The alpha-1 antitrypsin (AAT) test measures the amount of a protective protein made by your liver. This protein helps shield your lungs from damage and keeps inflammation in check. Your doctor may order this test if you have unexplained shortness of breath, a long-lasting cough, wheezing, or signs of liver disease. It is often used to detect alpha-1 antitrypsin deficiency, an inherited condition that can raise the risk of emphysema, chronic obstructive pulmonary disease (COPD), and liver problems.

Your healthcare provider may order this test if you have symptoms of lung diseases like chronic obstructive pulmonary disease (COPD) or emphysema, or if you have a family history of Alpha-1 Antitrypsin deficiency. It may also be used to monitor liver disease or to check for genetic conditions that affect protein production.

No special preparation is usually needed for this test, and you can typically eat and drink normally unless your doctor tells you otherwise. Tell your healthcare provider about all medicines, vitamins, and supplements you take, since certain drugs, such as birth control pills or steroids, can affect your results. Mention if you smoke as well. Wear a short-sleeved shirt or one with sleeves that roll up easily so the blood draw is more comfortable.

No special preparation is needed, but you may be asked to fast for 8–12 hours before the test if it involves drawing blood from your arm. Wear a loose shirt to make drawing blood easier.

A small sample of blood is drawn from a vein, usually on the inside of your elbow or the back of your hand. A technician will clean the area, wrap an elastic band around your upper arm, and insert a thin needle to collect the blood into a tube. You may feel a quick pinch or slight sting, and the process usually takes only a few minutes. After the needle is removed, pressure and a small bandage are applied, and the sample is sent to a laboratory for analysis.

Your doctor will determine the frequency based on your medical history, symptoms, and risk factors. Regular monitoring may be needed if you have a known deficiency or related conditions.

Normal alpha-1 antitrypsin levels generally fall between about 80 and 200 milligrams per deciliter (mg/dL), although exact ranges vary slightly by laboratory. A typical result suggests your body is making enough of this protective protein. A low level may point to alpha-1 antitrypsin deficiency, which increases the risk of lung and liver disease, while a high level can occur with infection, inflammation, pregnancy, or certain medications. Your doctor will interpret your result along with your symptoms, medical history, and other tests before recommending next steps.

Low levels of Alpha-1 Antitrypsin may indicate a genetic deficiency that increases your risk of lung or liver disease. High levels might be seen in certain liver conditions or during pregnancy. Your results will be compared to standard reference ranges provided by your lab.