Table 1.

Practical criteria to diagnose previous H. pylori infection–induced atrophic gastritis cases

Condition	Criteria
Past history of H. pylori eradication	No past history of H. pylori eradication
Diagnosis of mucosal atrophy	Endoscopically atrophic changes more than C2 in the Kimura‐Takemoto classification or glandular atrophy on histology
Exclusion of rare types of gastritis unrelated to H. pylori infection	Exclusion of autoimmune gastritis by endoscopic findings regarding the distribution of atrophy or by autoantibodies or histology
Diagnosis of negative for present H. pylori infection	Negative results for the urea breath test or stool antigen test while patient is not using PPIs and antibiotics. Positive serology with negative urea breath test or stool antigen test strongly suggests past infection but absence of infection presently.

Abbreviation: PPIs, proton‐pump inhibitors.