Medically reviewed by Robert Burakoff, MD Atrophic gastritis (AG), also called metaplastic atrophic gastritis (MAG), is a chronic (long-lasting) inflammation of the stomach lining, which leads to the ...

PCR is very sensitive but prone to producing false-positive results. Non-endoscopic tests include the 13 C-urea or 14 C-urea breath test (UBT), serology or an H. pylori stool antigen test.