<<Disclaimer: Verify this information before applying it to your situation.>> Thanks to everyone (24 letters!) who sent info on the meaning of the IgG and IgA tests. It was way to complicated for me so I just sent it on to my daughter! It would take me a year to figure out how to summarize. I saved most of the letters so if anyone wants info please contact me and I will forward them to you. Again, thank you all for the quick response. Jane in CA PS Some of you mentioned about how kids wait until the last minute to get things done. That wasn't the case here. She has been working on the paper for a long time, just couldn't find the info she wanted on the IgG/A so I offered to write to the list.