Celiac Disease is often misdiagnosed by non-specialists based on the symptoms and inaccurate or misinterpreted tests. Therefore, home tests should not be considered a diagnosys, just one more tool for obtaining information. These tests are serological and do not test the malfunctioning intestine directly, they only measure the molecules that cause the problem.

According to www.celiac.com

"To confirm the diagnosis, your doctor may need to do a biopsy, that is, microscopically examine a small portion of intestinal tissue to check for celiac associated damage to the small intestine. (...) To do this, your doctor takes a sample of intestinal tissue to look for damage to the villi (tiny, hair-like projections in the walls the small intestine that absorb vitamins, minerals and other nutrients)."

Complete and accurate diagnosis:
"The original criteria for diagnosis according to the European Society for Pediatric Gastroenterology and Nutrition, (ESPGAN), involved a year of arduous studies with:

* An initial positive gut biopsy;
* 6 months on a gluten free diet;
* A second, negative gut biopsy;
* A gluten challenge for 6 months and;
* A third, positive gut biopsy. The revised ESPGAN criteria call for positive results in two of the serological tests confirmed by a single positive biopsy. In practice, many gastroenterologists are utilizing the serologies in conjunction with a controlled diet and the clinical presentation to form a basis for diagnosis without the need for the invasive procedure."

I've been working with antibodies for many years now and it is really difficult to believe in a result that only says possitive or negative (appearence of a band giving a certain ammount of sample and time). The best way to check is to be tested by other methods that are quantitative, so you can know the baseline. After that, these home tests are useful for rutinary control.
They are not deffinitive as diagnostic tools.
Source(s):
www.celiac.com and ten years working with antibodies.

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