Helicobacter pylori IgG (immunoglobulin G) refers to antibodies produced by the immune system in response to an infection with the bacterium Helicobacter pylori. IgG antibodies are specific proteins produced by the immune system to identify and neutralize foreign substances, such as bacteria, viruses, or toxins.

In the case of Helicobacter pylori, IgG antibodies are formed when the immune system detects the presence of this bacterium in the body. Testing for Helicobacter pylori IgG antibodies is a common method used to diagnose H. pylori infection, particularly in cases of gastritis, peptic ulcers, and other gastrointestinal conditions associated with this bacterium.

However, it’s important to note that the presence of Helicobacter pylori IgG antibodies indicates exposure to the bacterium at some point, but it doesn’t necessarily confirm an active infection. Further diagnostic tests, such as stool antigen tests, urea breath tests, or endoscopic biopsies, may be required to confirm the current presence of H. pylori and its role in any associated gastrointestinal symptoms.