Normal limits of 14C-urea breath test

Area of Science:

• Gastroenterology
• Infectious Diseases
• Diagnostic Medicine

Background:

• The 14C-urea breath test is a common method for diagnosing Helicobacter pylori (H. pylori) infection.
• There is ongoing debate regarding the optimal cutoff values for identifying H. pylori negative subjects.
• Establishing reliable cutoff values is crucial for accurate H. pylori diagnosis.

Purpose of the Study:

• To determine baseline 14C-urea breath test values in H. pylori negative individuals.
• To calculate a definitive cutoff value for normalcy in H. pylori testing.
• To compare the diagnostic performance of the 14C-urea breath test with other established H. pylori detection methods.

Main Methods:

• 12 non-ulcer dyspepsia patients confirmed H. pylori negative via multiple biopsy analyses were studied.
• 12 H. pylori positive patients, confirmed by culture or combined tests, served as controls.
• 14C-urea breath test administered with breath samples collected at 5, 15, and 30 minutes post-ingestion.

Main Results:

• Mean 14C-urea breath test values were significantly lower in H. pylori negative patients compared to H. pylori positive patients across all time points (p < 0.001).
• Receiver operating characteristic (ROC) analysis yielded cutoff values of 0.01, 0.007, and 0.009 at 5, 15, and 30 minutes, respectively.
• The test demonstrated statistically significant differences between the two patient groups.

Conclusions:

• 14C-urea breath test levels are significantly lower in H. pylori negative individuals.
• The established cutoff values enhance the test's reliability for H. pylori detection.
• The 14C-urea breath test exhibits high sensitivity and specificity for diagnosing H. pylori infection.