How is common variable immunodeficiency (CVID) diagnosed?

How is common variable immunodeficiency (CVID) diagnosed?

A doctor might look into CVID as a possible cause if you have signs of an immune disorder or have unusual reactions to vaccines.

Your doctor will ask about your family medical history and order blood tests. A sample of your blood can reveal signs of CVID, including low levels of IgG.

Blood tests can also help your doctor evaluate how well your immune system functions. Your doctor may give you a vaccine for another condition to see how your body responds to the vaccine.