You would be relieved to know that you do not have the changed gene.

To have this condition, you have to get the changed gene from both parents.

Some people who carry the changed gene may have very mild symptoms of the deficiency.

Genetic testing is done with a blood test that looks for changed genes (mutations).

To pass on this disease, both parents must be carriers of the changed gene.

People who carry the changed gene may be more at risk for symptoms if they have certain types of alpha-1 antitrypsin.

The patient is tested first to see if he or she has the changed gene.

This means that the child will carry the changed gene but will not have the disease.

But most cases of colon cancer are not caused by changed genes.

A blood test can show whether you have the changed gene.