celiac testing

hi i have a few blood tests for celiac which came back neg and a few weeks ago because i was having problems while eating gluten based foods for a number of months had a biopsy done for celiac and this also came back neg.
i was just wondering i didnt eat a lot of gluten products before the biopsy would this make a difference or would there already be damage done from years of eating gluten based products.
i have a big promblem with digestion when eating such products and have lost a considerable amount of weight because of this.
all other major illness have been ruled out.i have autoimmiune thyroid disease and could this be effecting asorbation.
new to forum thanks guys

[GoingToMakeIt]

I have heard that it can affect the test. I like the enterolabs.com. They test the stool for antibodies to gluten. You can still be allergic to gluten and not be celiac sprue.

[lagoya]

thanks for your answer.i guess it could be an allergy to gluten and maybe i might look into that

[CalGal]

Get the fecal antibody test for gluten done via enterolab and double-check the results of the standard tests. IMO, the fecal antibody test is a darned good - if not better - test than what is currently used to diagnose celiac issues. Many people don't give positive results on either blood or biopsies until much later in the process. It's a shame because those people go on having problems for years before they're finally 'diagnosed' and they're already experiencing the numerous other problems that can emerge with long-term gluten expose.