Yes and no.
The "gold standard" for diagnosing celiac disease
(gluten allergy) is a biopsy
of the small intestine.
There are a few blood tests that are typically ordered and are usually positive in people with celiac disease, but they are not 100%. The stomach is usually not affected by gluten allergy. Rather than undergo more testing, go gluten free for 4-6 weeks and see if your symptoms improve.