Diagnosis and Management of H. pylori Infection

Pre-Test Preparation

Fasting for at least 4 hours before the test enhances the absorption of the test material and ensures results are due to the administered urea rather than previously ingested food, with extended fasting up to 12 hours for anticipated late reactions 1
Eating before the test can interfere with test accuracy by diluting the urea solution or affecting its contact with the stomach lining 1
For children or individuals who cannot fast for extended periods, a light meal (half of the usual amount) can be administered 2 hours before the test, but this should be discussed with your healthcare provider as it may affect test accuracy 1

The American Gastroenterological Association recommends the urea breath test (UBT) as a first-line non-invasive test for H. pylori detection in patients with uninvestigated dyspepsia who are under 45-55 years of age without alarm symptoms, with a sensitivity of 88-95% and specificity of 95-100% 2, 3, 4
Low-dose (75mg) 13C-urea is as accurate as higher doses and more cost-effective for H. pylori detection, with the added benefit of avoiding endoscopy-related risks and costs 5
The stool antigen test (SAT) is also a valid non-invasive test, with a sensitivity of 94% and specificity of 92% 6
Endoscopy-based testing is required for complicated peptic ulcer, gastric ulcer, and MALT lymphoma, and can include rapid urease test plus histology, with multiple biopsies needed (at least two from both antrum and body) 7
Patients ≥45-55 years with alarm symptoms (anemia, weight loss, dysphagia) should undergo endoscopy, where rapid urease test or histology from biopsies can be used for H. pylori detection, with a sensitivity of 80-95% and specificity of 95-100% in pretreatment settings 2, 8, 3

Proton pump inhibitors (PPIs) significantly reduce the sensitivity of urea breath tests (UBT) for H. pylori detection, causing false-negative results in up to 40% of patients, and should be discontinued for at least 2 weeks before testing to ensure accurate results, as recommended by the American Gastroenterological Association 8, 6
If PPI therapy cannot be interrupted, consider using validated IgG serology testing, which is not affected by PPI use as antibodies remain present for months, but cannot distinguish between active infection and past exposure 6, 9, 3

Testing should be performed at least 4 weeks after completion of eradication therapy, as recommended by the American Gastroenterological Association and the European Helicobacter Study Group 3, 10, 7
Eradication therapy is recommended for patients found to have H. pylori infection, as suggested by the American Society of Hematology and the American Gastroenterological Association, and can help resolve iron deficiency anemia 11, 12
If H. pylori persists after initial treatment, a second different eradication regimen should be used, as suggested by the American College of Gastroenterology, and after two failed treatment attempts, culture and antibiotic susceptibility testing is recommended 10, 13
The American College of Gastroenterology typically recommends triple therapy, including omeprazole, clarithromycin, and amoxicillin, for 10 days, which has shown eradication rates of 77-90% in clinical trials 8

Patients with bleeding peptic ulcers, iron deficiency anemia, or alarm symptoms (anemia, weight loss, dysphagia) should be tested for H. pylori, as recommended by the American Gastroenterological Association and Gut 4, 7
The British Society of Gastroenterology suggests considering endoscopy for patients with age over 45 years with alarm symptoms (anemia, weight loss, dysphagia) 10