Background: Helicobacter pylori (H. pylori) is a significant contributor of various gastrointestinal disorders and cancers all around the world. Its diagnosis is dependent on several qualitative and quantitative methods. The present study aims to compare the results of rapid cassette and micro ELISA test methods for diagnosis of H. pylori and determining associations with patient endoscopy reports. Methods: The study was performed using blood samples collected from 224 patients (142 (63%) females and 82 (37%) males) in various clinics between January 2018 and August 2019, which were sent to the Clinical Microbiology Laboratory of Training Hospital. Serum samples obtained after centrifugation of the blood samples were initially tested with rapid H. pylori IgG cassette method, and afterwards in the auto analyzer using ELISA assays specific for H. pylori. Results: Upper gastrointestinal system endoscopy was performed in 88 of these patients, and biopsy results confirmed definitive diagnosis of H. pylori infection in 63 of the patients. Rapid H. pylori cassette test results of the 224 patients were negative for 158 (70.5%) patients and positive for 66 (29.5%) patients, whereas micro ELISA IgA test results were negative for 110 (49.1%) patients and positive for 114 (50.9%) patients. Micro ELISA IgG test results were negative for 85 (37.9%) patients and positive for 139 (62.1%) patients. Conclusion: Invasive diagnostic methods for H. pylori infection may sometimes be inconvenient, and therefore the diagnosis may have to rely on non-invasive tests. Bases on the study results, we believe micro ELISA test results are more reliable with regard to avoidance of missed diagnosis.
