A diagnosis of Celiac disease can be made by several different methods. A biopsy of the intestine can be done, there is a syliva test, a stool test, and a blood test.
The options are becoming increasingly easier. The fastest, least invasive method seems to be the home test.

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“If you do test positive according to the Biocard™ Celiac Test kit, see your doctor; and continue with a normal diet under the continued supervision of your doctor until you have the diagnosis confirmed. The good news is, more than 70% of people with Celiac disease respond to a gluten free diet within days or weeks.
And remember, if you have tested positive for Celiac disease, early screening with the Biocard™ Celiac Test for your children, siblings and parents is important, as their risk factor for Celiac disease is reportedly 1 in 10.”
(celiachometest.com)
