Management of Positive H. Pylori Test

Initial Patient Stratification

The American Gastroenterological Association recommends that patients under age 45 without alarm symptoms can be treated empirically after positive H. pylori testing without endoscopy 2, 3, 1
The European Helicobacter Study Group suggests that patients over age 45 or those with alarm symptoms at any age require endoscopy before treatment to exclude gastric malignancy, as the standardized incidence rate of gastric cancer in those over 45 is 19 per 100,000 for men and 9 per 100,000 for women 2, 3, 1
Patients with a known history of gastric ulcer should be referred for repeat endoscopy with biopsy until healed, as malignancy may be present 4, 2
It is essential to rule out family history of gastric cancer before treating without endoscopy, even in younger patients 2, 3

In areas of high clarithromycin resistance (≥15%), the American College of Gastroenterology strongly recommends bismuth quadruple therapy for 14 days as first-line treatment 5
The World Gastroenterology Organisation suggests that bismuth subsalicylate + tetracycline 500 mg four times daily + metronidazole 500 mg four times daily + PPI twice daily provides superior eradication rates without requiring susceptibility testing 5
In areas of low clarithromycin resistance (<15%), the European Helicobacter Study Group recommends standard triple therapy for 14 days consisting of PPI + clarithromycin 500 mg twice daily + amoxicillin 1 g twice daily 7, 1

If first-line treatment contained clarithromycin, the American Gastroenterological Association suggests bismuth quadruple therapy for 14 days (if not previously used) or levofloxacin triple therapy for 10-14 days: PPI + levofloxacin + amoxicillin 6
A salvage regimen must avoid antibiotics that were previously used, and review prior antibiotic exposures thoroughly before prescribing 8

The American College of Gastroenterology strongly recommends performing urea breath test (UBT) at minimum 4 weeks after completing therapy with sensitivity of 94.7-97% and specificity of 95-100% 8, 5
Laboratory-based validated monoclonal stool antigen test is an acceptable alternative with sensitivity and specificity >90% 8
The European Helicobacter Study Group suggests that serology should not be used for determining eradication success—it cannot distinguish active infection from past exposure 8, 1

The American Gastroenterological Association recommends that uncomplicated duodenal ulcer patients do not require prolonged PPI therapy after successful eradication 8
Gastric ulcer patients should continue PPI until complete healing is achieved and eradication is confirmed 8
Complicated duodenal ulcer or bleeding ulcer patients should continue PPI until H. pylori eradication is confirmed 8