The Use of 13C-Urea Breath Test for Non-Invasive Diagnosis of Helicobacter pylori Infection in Comparison to Endoscopy and Stool Antigen Test

Helicobacter pylori(H. pylori) can cause gastritis, peptic ulcer diseases and gastric carcinoma. Endoscopy as the gold standard method of diagnosis is an invasive procedure that might not be suitable in all scenarios. Therefore, this first study in Jordan aimed to assess the non-invasive C-13 urea breath test (UBT) and stool antigen test for diagnosis ofH. pyloriinfection and the successfulness of eradication therapy as alternatives for endoscopy. Hence, a total of 30 patients attending the endoscopy units at Alkarak teaching hospital were asked to complete a questionnaire with demographic and clinical data. They were then tested forH. pyloriusing C-13 UBT andH. pyloristool antigen before having endoscopy. Another 30 patients who were positive forH. pyloriby endoscopy were tested using both tests 6 weeks post eradication therapy. Results showed that the rate ofH. pyloridetection using endoscopy was 56.7% (17/30). Heartburns (82.3%,pvalue = 0.019), epigastric pain (88.2%,pvalue = 0.007) and vomiting (70.5%,pvalue = 0.02) were the most significant symptoms. Family history of peptic ulcer diseases was significantly associated with an increased risk for having aH. pyloripositive result (pvalue = 0.02). Compared to endoscopy, the sensitivity of C-13 UBT for the diagnosis ofH. pyloriwas 94.1% (16/17), while it was 76.5% (13/17) for the stool antigen test. The specificity of both tests was equal (76.9%). However, the positive predictive and negative predictive values (84.2% and 90.9%) for C-13 UBT were higher than those (81.3% and 71.4%) for the stool antigen test. The accuracy of C-13 UBT was 86.7% compared to 76.7% for the stool antigen test. There was an 87% agreement (20 patients out of 23) between both tests when used to assess success of the eradication therapy. In conclusion, the(13)C UBT was found to be more sensitive and accurate than the stool antigen test when used for diagnosis; furthermore, it has a comparable outcome to the stool antigen test in assessing the successfulness of the eradication treatment.