Diagnosis and Management of H. pylori Infection

Diagnostic Methods

The stool antigen test is a highly accurate non-invasive diagnostic method for detecting active Helicobacter pylori infection, with sensitivity and specificity of approximately 93%, making it comparable to the urea breath test and an excellent alternative for both initial diagnosis and post-treatment confirmation of eradication 1
The stool antigen test directly detects H. pylori bacterial antigens in stool specimens, providing evidence of active infection rather than just past exposure 2, 3
The test is particularly valuable in the "test and treat" strategy for young dyspeptic patients without alarm symptoms, reducing the need for invasive endoscopy 4
The European Helicobacter Pylori Study Group recommends using either the urea breath test or stool antigen test for initial diagnosis of H. pylori infection 1

False negative results can occur if patients have recently taken antibiotics, bismuth compounds, or proton pump inhibitors; these medications should be discontinued at least 2 weeks before testing 5
Unlike serological tests which remain positive long after infection clearance, the stool antigen test only detects active infection, making it valuable for confirming eradication 5
The test is more practical than invasive diagnostic methods, avoiding the discomfort, expense, and potential complications associated with endoscopy 3
Some patients may have aversion to collecting stool samples, which could affect compliance 5