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Subjects with a high-negative titer (3-9.9 U/ml) of serum anti- Helicobacter pylori ( H. pylori ) antibody represent a heterogeneous group of currently H. pylori -infected, H. pylori -uninfected, and previously H. pylori -infected cases. We investigated the characteristics of subjects with a high-negative titer during a medical check-up and the utility of H. pylori infection score, the sum of scores of endoscopic findings based on the Kyoto Classification of Gastritis, for diagnosing H. pylori infection. Subjects with 13 C-urea breath test-positive or H. pylori stool antigen test-positive were diagnosed as currently H. pylori -infected. Although around half of subjects with a high-negative titer were after eradication therapy (48.6%), currently H. pylori -infected were considerably confirmed (11.7%). H. pylori infection score showed a high value of area under the receiver operating characteristic curve [0.92; 95% confidence interval (CI), 0.84-1.00] with the most suitable cut-off value of 1.0 (sensitivity: 0.92; specificity: 0.90). Multivariate logistic regression analysis revealed that H. pylori infection score was an independent factor associated with increased prevalence of H. pylori infection (odds ratio, 9.53; 95% CI, 2.64-34.40; p &lt;0.001). Currently H. pylori -infected subjects were considerably included among the subjects with a high-negative titer, and the Kyoto Classification of Gastritis was useful to predict current H. pylori infection.

journal of clinical biochemistry and nutrition

Utility of Kyoto Classification of Gastritis in subjects with a high-negative titer of anti-&lt;i&gt;Helicobacter pylori&lt;/i&gt; antibody during a medical check-up