Blood test and biopsies are sort of unreliable. I think the best thing is to cut out foods that contain gluten for awhile and see if your symptomes improve.
um, biopsy is not unreliable. i was biopsied for ulcers, without any suspicion at all of celiac, and the results came back as celiac disease. not unreliable at all.
it's also important to remember that ingesting ANY gluten will cause damage to the small intestine. it doesn't matter if you have overt symptoms or not, the damage is still occurring.