Serologic tests are done to measure specific H.pylori IgG antibodies; their presence indicates that the patient has a peptic ulcer caused by an infectious disease.

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H.pylori is a spiral-shaped bacterium that can infect the gastric mucosal layer or adhere to the epithelial lining of the stomach.H.pylori causes more than 90% of duodenal ulcers and more than 80% of gastric ulcers.Several methods may be used to diagnose H.pylori infection.Serologic tests that measure specific H.pylori IgG antibodies can determine whether a person has been infected.

Serologic Tests Are Done to Measure Specific H