בדיקה

כן, יש להפסיק נטילת אנטיביוטיקות ארבעה שבועות לפני הבדיקה.

Stool antigen assay — The detection of bacterial antigen indicates an ongoing H. pylori infection. Stool antigen testing can therefore be used to establish the initial diagnosis of H. pylori and to confirm eradication [3]. Of the available tests, stool antigen testing is the most cost effective in areas of low to intermediate prevalence of H. pylori [36]. (See 'Patients not undergoing upper endoscopy' above and 'Confirmation of eradication' below.) The sensitivity and specificity of the laboratory-based monoclonal enzyme immunoassay (94 and 97 percent, respectively) are comparable to the UBT [37-48]. Stool antigen testing is affected by the recent use of bismuth compounds, antibiotics, and PPIs. Although some data suggest that stool antigen test is predictive of eradication as early as seven days after completion of therapy, to reduce false-negative results, patients should be off antibiotics for four weeks, and PPIs for one to two weeks, prior to testing [19,32,40,49,50]. In the setting of active bleeding from peptic ulcers, the specificity of the stool antigen testing may decrease [51,52].