2 doctors weighed in:

What exactly does a low IgG (3) level indicate?

2 doctors weighed in
Dr. John Overholt
Internal Medicine - Allergy & Immunology
1 doctor agrees

In brief: Immunodeficiency

Immunoglobulin g, igg, is an antibody, a protein that the immune system makes to help fight infection.
Igg floats around in the blood stream and helps fight bacteria and viruses. An igg level of 3 is exceedingly low. In most labs, a normal igg level is around 700. Low igg can predispose you to having recurrent infections. You should see an immunologist about igg replacement.

In brief: Immunodeficiency

Immunoglobulin g, igg, is an antibody, a protein that the immune system makes to help fight infection.
Igg floats around in the blood stream and helps fight bacteria and viruses. An igg level of 3 is exceedingly low. In most labs, a normal igg level is around 700. Low igg can predispose you to having recurrent infections. You should see an immunologist about igg replacement.
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