I don't know that this was the study I was thinking of, but it does mention some being seronegative at three months.
If you ran the test and got a positive, you could rely on that. However, if you get a negative there would always be the chance it was a false negative if your antibodies had dropped.
I think I have heard a couple of weeks off gluten would not affect test results. But, more than that... the test would be compromised.
How long have you been off gluten? And yes, even if celiac blood tests are negative, you might still benefit from a diet. I think it is worth doing the blood tests to see if an official diagnosis is possible.
http://www.ncbi.nlm.nih.gov/entrez/q..._uids=10710062
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Of 53 initially EmA-positive patients who completed study criteria, EmA was undetectable in 31 patients (58%) after 3 months' diet, in 40 (75%) after 6 months, and in 46 (87%) after 12 months
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