Helicobacter Pylori Antigen, Stool
Campylobacter pylori, H. pylori, gastritis, Helicobacter pylori Antigen, Stool, EPIC: LAB7094, SOFT: XHPAG
Patients should not take antibiotics, bismuth preparations, or proton pump inhibitors for two weeks prior to testing.
Specimen Collection Criteria
Collect: Random stool specimen (10 grams) in a sterile collection container with no preservatives. (Min: 1.0 g)
Physician Office/Drawsite Specimen Preparation
Maintain specimen frozen (-20°C/-4°F or below) prior to transport.
Preparation for Courier Transport
Transport: Stool in a sterile collection container, frozen (-20°C/-4°F or below). (Min: 1.0 g)
- Rectal swabs.
- Watery stools.
- Stool specimens received in transport media or preservative.
- 24 hour collection of stool.
Specimen Stability for Testing:
Room Temperature (20-26°C or 68-78.8°F): Unacceptable
Refrigerated (2-8°C or 36-46°F): 72 hours
Frozen (-20°C/-4°F or below): 30 days
Specimen Storage in Department Prior to Disposal:
Specimen retention time is determined by the policy of the reference laboratory. Contact the Sendout Laboratory with any questions.
Sent to Warde Medical Laboratory, Ann Arbor, MI then forwarded to Quest Diagnostics Nichols Institute, San Juan Capistrano, CA.
Saturday - Sunday.
Results available 4-6 days.
Negative for H. pylori antigen.
Enzyme Immunoassay (EIA).
The sensitivity of the assay has been reported to be 89% with a 94-95% specificity.
Antimicrobials, proton pump inhibitors and bismuth preparations are known to suppress H. pylori growth. Ingestion of these agents within two weeks of H. pylori antigen may produce false negative results.
Testing to confirm eradication of H. pylori should be done four or more weeks after completion of therapy.
This assay provides a non-invasive method for the identification of Helicobacter pylori in stool. Test results are intended to aid in the diagnosis of H. pylori infection, and to monitor response during and after therapy in adult patients.
Nearly 70% of gastric ulcers and more than 90% of duodenal ulcers have been associated with H. pylori infections. H. pylori infection has also been associated with adenocarcinoma of the stomach. Nearly all patients with H. pylori have antral gastritis.
Prevalence of infection increases with age. By 60 years of age, 50% of patients have evidence of H. pylori infection. Despite this high incidence, disease is seen in only a small percentage of this population (less than 2%). African Americans and Hispanics have increased infection rates over non-Hispanic Caucasians. Infection rates are higher in lower socioeconomic areas. Infection is infrequent in childhood.
H. pylori is believed to be transmitted by the fecal-oral route. Enhanced transmission can occur in areas with overcrowded living conditions. Patients with H. pylori infection may develop acute gastritis within two weeks following infection.
- Lawson, A.J. 2011. Heliobacter. Manual of Clinical Microbiology, 10th edition. Versalovic, J. et. al. (eds.) ASM Press. Washington, D.C.