Cvs celiac test

Has anyone done the celiac cvs test? I've been having yellow or light colored stools for over 2 years. At first it was regular stool but light in color. After about a year it went to loose stools and diahrea. I've had liver tests, alot of blood test, stool tests and nothing is found. I have deficiencies like vitamin d, e, k and calcium. Probable more. I asked my doctor about sibo/ testing and he said those test were not reliable. I asked about celiac because I alos have mucus and it close that there is inflammation. But was blown off. I saw a celiac test at cvs and wondered if it was reliable. Anyone used this test before? Or can recommend an at home test