igg subclass

http://www.sciencedirect.com/science/article/pii/S0198885915004656?showall%3Dtrue%26via%3Dihub

Just wondering how common it is for us to have documented immunodeficiencies here on PR. If you have had one of these (IgE for example) very HIGH, please select this response and elaborate in a comment. Thank you so much, guys! Please spread this around, inquiring minds want to know. :) Um...