Diagnostic accuracy of tests for Helicobacter pylori in an Alaska Native population

Figure 1 Among persons negative for Helicobacter pylori by the gold standard, the percentage of persons with a documented previous treatment for Helicobacter pylori according to the antibodies to Helicobacter pylori immunoglobulin G optical density (n = 118). HP: Helicobacter polori; OD: Optical density.

Figure 2 The receiver operating characteristic curves for anti-Helicobacter pylori level (serological test) and ¹³C urea breath test delta over baseline vs the gold standard for Helicobacter pylori infection in a group of 280 Alaskans undergoing esophagogastroduodenoscopy. Gold standard was a positive Helicobacter pylori test by culture or, in the case of a negative culture result, a positive histology result and a positive campylobacter-like organism test. ROC: Receiver operating characteristic; UBT: Urea breath test; DOB: Delta over baseline; HP: Helicobacter polori; IgG: Immunoglobulin G.

Figure 3 The amount of Helicobacter pylori (numerous, moderate, focal) on histological examination according to the delta over baseline value for the ¹³C urea breath test among Helicobacter pylori positive persons (n = 149).