Treatment of Antral Gastritis with Negative Rapid Urease Test

Understanding the Negative RUT Result

The American Gastroenterological Association suggests that a negative rapid urease test (RUT) does not definitively exclude H. pylori infection, as several factors can produce false negative results, including recent medication use, such as PPIs, antibiotics, and bismuth compounds, which temporarily reduce bacterial load 2, 3
The sensitivity of RUT ranges from 80-95%, meaning up to 20% of infected patients may test negative, and low bacterial density can also lead to false negative results 4

The American College of Gastroenterology recommends initiating empirical proton pump inhibitor (PPI) therapy at high doses, such as esomeprazole 20-40 mg or rabeprazole 20 mg twice daily, 30 minutes before meals, for 4-8 weeks, while recognizing that the negative RUT may be falsely negative if the patient was recently on PPIs, antibiotics, or bismuth 1
First-line PPI options include rabeprazole 20 mg twice daily, esomeprazole 20-40 mg twice daily, and lansoprazole 30 mg twice daily, with a duration of 4-8 weeks initially 1, 5

For patients on acid suppression therapy, H. pylori can migrate from the antrum to the gastric corpus, and testing only the antrum may miss infections in patients on acid suppression, although this specific fact is not directly cited, a related fact is that if endoscopy is performed, biopsies from both antrum and corpus should be obtained, and histology with special stains, such as immunohistochemistry, is the gold standard for diagnosis 4, 3
The American Heart Association is not relevant here, however, the guideline suggests that if the patient has been taking NSAIDs, the lowest effective NSAID dose should be used for the shortest duration, and PPI therapy should be continued for gastroprotection, and H. pylori eradication should be considered before starting long-term NSAID therapy if infection is confirmed 1

If symptoms persist despite adequate PPI therapy, reassess for H. pylori with non-invasive testing after medication washout, and consider endoscopy to rule out other causes, such as malignancy or other forms of gastritis 3, 5, 1
Antacids can be used on-demand for breakthrough symptoms, and the guideline recommends against relying solely on a single negative RUT in patients with recent medication use or high clinical suspicion, and against inadequate PPI dosing or premature discontinuation of treatment, and against using serological testing to confirm or exclude active H. pylori infection 1, 2, 3