What Is H. Pylori Ag Test?
Helicobacter pylori (H. pylori) is a bacteria that infects the stomach lining and is a leading cause of ulcers and gastritis. This bacterial infection results in various gastrointestinal problems including peptic ulcers and can in extreme cases increase the risk of stomach cancer.
The test identifies H. pylori antigens (proteins produced by the bacteria) in a patient’s stool sample. It is a non-invasive method widely recommended for diagnosing an active H. pylori infection and for confirming eradication after treatment.
Doctors usually warrant this test when a patient shows persistent gastrointestinal symptoms such as stomach pain, bloating, nausea or unexplained weight loss. It is an effective alternative to blood antibody tests, as it directly detects an active infection rather than past exposure.
How is the Test Performed?
Sample Collection
A small quantity of stool is collected in a clean, sterile container making sure the sample is free from any contaminants like urine, water or tissue.
Lab Testing
The sample is then sent to a laboratory, where it is tested for H. pylori antigens using an enzyme immunoassay (EIA) or immunochromatographic method. These techniques detect specific proteins associated with the bacteria.
Results
- Results are typically available in 24 hours.
What are the symptoms that prompt this test?
The H. Pylori antigen test is recommended when an individual exhibits symptoms of gastrointestinal distress, which may indicate an H. pylori infection. Symptoms vary across age groups and genders:
Adults
- Persistent stomach pain or burning sensation
- Bloating or excessive gas
- Nausea or vomiting
- Loss of appetite or unexplained weight loss
- Frequent burping or indigestion
- Black or tarry stools (indicating gastrointestinal bleeding)
- Anemia or weakness
Children
- Abdominal pain or discomfort
- Nausea or vomiting
- Poor growth or weight loss
- Fatigue or irritability
What are Normal Ranges for This Test?
The H. pylori test is qualitative, meaning it results in positive or negative presence of the H. pylori infection rather than a numerical value. A normal result means there was no presence of H. pylori antigens which means there is no active infection in the body.
**The above mentioned range is for information purpose only. Normal levels are dependent on how the test is conducted. Result interpretation should be done by a qualified doctor or healthcare professional.**
What Happens if Test Results Show Abnormal Levels?
Abnormal results mean there is an active infection and your doctor may recommend:
- Further testing – Urea breath test, stool culture, or endoscopy with biopsy.
- Treatment Plan –A combination of antibiotics and acid-reducing medications (proton pump inhibitors) for eradication.
- Follow-Up Testing –Repeat stool antigen test after treatment to confirm the infection is cleared.
- Dietary and Lifestyle Changes –Patients may be advised to avoid spicy foods, alcohol, and smoking to aid stomach healing.
A follow up test might be recommended after some time to confirm if the infection has been eradicated. If the test results are normal but symptoms persist, your doctor may recommend other tests to diagnose the problem.
