IgE is a test to determine how allergic you are. For example, my
allergist says that the average patient he sees is below 100 and my
results were 403.3. It is because of this high IgE that he doesn't
even want to try allergy shots.

http://www.aafa.org/display.cfm?id=8&sub=104&cont=587

[Posted in FML 6056]