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Eur J Gastroenterol Hepatol. 2001 Jul;13(7):807-10.

Qualitative and quantitative clinical evaluation of the laser-assisted ratio analyser for detection of Helicobacter pylori infection by (13)C-urea breath tests.

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  • 1Department of Internal Medicine II, University Hospital, Frankfurt, Germany. Braden@em.uni-frankfurt.de

Abstract

OBJECTIVES:

Currently, the (13)C-urea breath test is the reference method for non-invasive diagnosis of Helicobacter pylori infection and therapy control. Therefore, new technologies have been developed to measure the ratio of (13)CO(2)/(12)CO(2) in breath. The laser-assisted ratio analyser (LARA) device is based on optogalvanic effects of the stimulated CO(2) molecules.

DESIGN:

In this study, the LARA system is prospectively compared to conventional isotope ratio mass spectrometry (IRMS) analysis of (13)C-urea breath tests.

METHODS:

The (13)C-urea breath test was used to screen 103 patients for H. pylori infection. Breath samples were analysed by LARA and IRMS techniques.

RESULTS:

Seven breath tests could not be analysed by the LARA system, one by IRMS. Out of the remaining 95 breath tests, 13 were positive for H. pylori infection (13.7%). In reference to IRMS analysis (with a cut-off of > 5 delta per thousand at 30 min), LARA produced one false positive and one false negative breath test result giving a sensitivity of 92.3% and a specificity of 98.8%. The mean difference in delta over baseline values between IRMS and LARA measurements was 2.02 delta per thousand +/- 5.48 delta per thousand.

CONCLUSION:

LARA allows the reliable qualitative evaluation of 13C-urea breath tests, but the quantitative results differ from IRMS findings.

PMID:
11474310
[PubMed - indexed for MEDLINE]
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