<<Disclaimer: Verify this information before applying it to your situation.>> >I've seen numerous dermatologists, some with a high degree of celiac >knowledge. Had biopsies sent to Yale/New Haven Hospital. No one knows what >this rash is -- it's not DH. A doctor once told me that IgA deficient patients will have false negative biopsies for DH because labs use IgA as a marker. Perhaps someone on the list with lab or dermatology experience can confirm or deny this. Rob San Diego, CA [log in to unmask]