<<Disclaimer: Verify this information before applying it to your situation.>> Hi: After my post about the ANA test, I received several emails wondering what an ANA test is. So, I thought I'd post this to the list rather than reply individually. I didn't know about it either until my physician ordered one. I found a site on the web that described it as an anti-nuclear antibody test for the detection in human serum or plasma of anti-nuclear autoantibodies. This is the web site: http://www.scimedx.com/ana.htm It is used to diagnose lupus, among other things. I have learned that approx. 10% of the population have elevated ANA, but nothing else is physically wrong. The above site mentions IgG, which I though was interesting. I have already had several responses to my post which were very helpful. I will summarize them soon. Thanks everyone! Maggie