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Limitations to carbon 13-labeled urea breath testing for Helicobacter pylori in infants

C Imrie1, M Rowland, B Bourke

  • 1Department of Paediatrics, The Conway Institute of Molecular and Biomedical Research, University College, Dublin, Ireland.

The Journal of Pediatrics
|November 20, 2001
PubMed

Insights

The carbon 13-labeled urea breath test is valid for children, but false positives are more common in those under 2 years. Oral bacteria may cause these results, so careful interpretation is needed for this age group.

Area of Science:

  • Pediatric Gastroenterology
  • Diagnostic Testing
  • Microbiology

Background:

  • The carbon 13-labeled urea breath test (13C-UBT) is a non-invasive method for detecting Helicobacter pylori infection.
  • Accurate diagnosis is crucial for appropriate treatment, especially in pediatric populations.
  • Previous studies have established the efficacy of 13C-UBT in older children and adults.

Purpose of the Study:

  • To evaluate the diagnostic accuracy and validity of the 13C-UBT in young children.
  • To identify potential factors contributing to discrepancies in test results in this age group.

Main Methods:

  • The study assessed the specificity and sensitivity of the 13C-UBT in a cohort of young children.
  • Comparison of results was made between children younger than 2 years and older children.
  • Investigated the impact of oral-urease-producing organisms by comparing oral versus intragastric administration of 13C urea.

Main Results:

  • The 13C-UBT demonstrated high specificity (greater than 90%) in the studied pediatric population.
  • Borderline or false-positive results were significantly more frequent in children younger than 2 years compared to older children.
  • Direct intragastric administration of 13C urea reduced excess delta 13CO2, suggesting oral-urease-producing organisms as a cause of false positives.

Conclusions:

  • While the 13C-UBT is a valid diagnostic tool, caution is advised when interpreting positive results in children under 2 years of age.
  • The presence of oral-urease-producing organisms may contribute to false-positive 13C-UBT results in very young children.
  • Further research may be needed to refine the interpretation of 13C-UBT in infants and toddlers.

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