Simple 13C-urea breath test with infra-red spectrophotometer

Area of Science:

• Gastroenterology
• Medical Diagnostics
• Analytical Chemistry

Background:

• Mass spectrophotometric analysis of the 13C-urea breath test for H. pylori infection is effective but costly and complex.
• Simpler, more accessible diagnostic methods are needed for H. pylori detection.

Purpose of the Study:

• To evaluate infra-red spectrophotometry as a substitute for mass spectrophotometry in the 13C-urea breath test for diagnosing H. pylori infection.
• To assess the accuracy, sensitivity, and specificity of infra-red spectrophotometry compared to mass spectrophotometry.

Main Methods:

• 181 breath samples from 153 patients were analyzed using infra-red spectrophotometry 15 minutes after ingesting 13C-urea.
• Results were compared with mass spectrophotometry and direct H. pylori detection from biopsy specimens.
• The 13CO2/12CO2 ratio was measured to determine H. pylori infection status.

Main Results:

• Infra-red spectrophotometry showed high correlation (r = 0.996) with mass spectrophotometry.
• Sensitivity was 97.8% and specificity was 74.4% for infra-red spectrophotometry.
• The mean 13C-urea breath test values were significantly higher in H. pylori-positive patients.

Conclusions:

• Infra-red spectrophotometry is a technically simple, cost-effective, and accurate method for diagnosing H. pylori infection.
• This method holds significant potential for both initial diagnosis and monitoring treatment efficacy.
• The findings suggest infra-red spectrophotometry can overcome the limitations of traditional mass spectrophotometry for urea breath tests.