<<Disclaimer: Verify this information before applying it to your situation.>> Hello, Do any of you know whether the ELISA tests for anti-gliadin IgA, anti-gliadin IgG, and anti-tTG IgA are standardized? I know that ELISA results vary depending on what format is used, the sensitivity of the test, the presence of interfering substances, etc. I would expect that the normal range would vary from test to test, unless they are standardized in some way. This is why the sensitivity of the assay or the method detection limit are always reported in peer-reviewed journal articles. I started wondering about this more when I found that the normal range for IgG tests differed between two different labs that tested me. Also, I'm not sure what units they are using. Is there an international standard unit (usually reported as IU)? One of my tests was reported as AU, which probably means absorption units; this suggests even more that the normal range may vary from test to test. If no one here knows, I probably will contact a lab to see what they say. Thank you, Erin _________________________________________________________________ Help STOP SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail *Support summarization of posts, reply to the SENDER not the CELIAC List*