The Helicobacter pylori IgG (Anti-H. pylori IgG) test measures IgG antibodies in the blood that the immune system produces in response to Helicobacter pylori infection. Unlike the IgM test, which detects recent infections, the IgG test can indicate past infection or chronic infection with H. pylori, as IgG antibodies remain in the bloodstream for a long time after the infection.
✅ Detects Past or Chronic H. pylori Infection – A positive IgG test typically indicates that an individual has been exposed to H. pylori at some point in their life, either recently or long ago.
✅ Assesses Ongoing Infection – Although IgG indicates past exposure, persistent IgG antibodies could suggest that the infection is still active and chronic.
✅ Guides Diagnosis and Treatment – If symptoms like gastritis, ulcers, or chronic stomach pain persist, this test can help confirm if H. pylori is involved.
✅ Determines the Need for Treatment – If someone has a positive IgG test along with symptoms or a history of ulcers, treatment with antibiotics and proton pump inhibitors may be necessary.
🩸 Blood Sample Collection – A blood sample is drawn from a vein in your arm and analyzed in a lab using techniques like ELISA (Enzyme-Linked Immunosorbent Assay) or Chemiluminescent Immunoassay (CLIA) to detect IgG antibodies against H. pylori.
| Result | Interpretation | Next Steps |
|---|---|---|
| Positive | Past or chronic infection with H. pylori | If symptomatic, consider further testing (urea breath test, stool antigen test) and start treatment if needed. |
| Negative | No exposure or past infection with H. pylori | Consider other causes for symptoms (if present), or confirm absence of infection. |
📌 **A positive Anti-H. pylori IgG result indicates a past or chronic infection, not necessarily an active infection.
| Test | Purpose | Result Interpretation |
|---|---|---|
| Anti-H. pylori IgM | Recent or acute infection | Positive indicates early infection. |
| Anti-H. pylori IgA | Mucosal immunity, suggests active infection | Elevated levels suggest active infection. |
| H. pylori Urea Breath Test | Detects active infection via urease activity | Positive indicates ongoing infection. |
| H. pylori Stool Antigen Test | Detects active infection from stool sample | Positive indicates active infection. |
📌 IgG is useful for confirming past exposure or chronic infection, while IgM indicates recent infection and IgA may help detect active infection.
✔ People with symptoms of gastrointestinal distress, such as abdominal pain, bloating, indigestion, or nausea that could indicate gastritis or ulcers caused by H. pylori.
✔ Patients with a history of peptic ulcers who may need confirmation of H. pylori infection.
✔ Individuals with long-term or recurrent digestive issues, like chronic gastritis, stomach discomfort, or acid reflux, which may be linked to an ongoing H. pylori infection.
✔ **People at risk for gastric cancer or stomach ulcers, as H. pylori infection is a major risk factor.
✔ Anti-H. pylori IgG is the most common test to detect past exposure or chronic infection with H. pylori.
✔ A positive result indicates previous infection, but it does not confirm whether the infection is still active.
✔ For active infections, further tests like H. pylori urea breath test or stool antigen test are used.
✔ Treatment for H. pylori infection typically includes a combination of antibiotics and proton pump inhibitors to heal ulcers and eliminate the bacteria.