Maybe IGA deficient? in Celiac Disease Pre-Diagnosis, Testing & Symptoms Posted Sunday at 02:22 AM · Report to Admin Hi, There are some people who are IgA deficient, meaning they don't make much IgA antibodies. They test for that by doing a serum or total IgA count. You could ask if they did that test. If you are IgA deficient the yes, the IgG test is the better way to go.