Helicobacter pylori IgG, Serum is a blood test used to detect IgG antibodies against the bacterium Helicobacter pylori. This bacterium is a common cause of gastritis and gastric ulcers and is sometimes associated with the development of stomach cancer. The test measures the level of antibodies in the serum, indicating a current or past infection. It is typically used as part of the clinical evaluation to determine the impact of the infection on the digestive system and to guide an appropriate treatment plan.