Urea Breath Test for Diagnosing Helicobacter pylori Infection

Purpose and Diagnostic Accuracy

The urea breath test (UBT) is a highly accurate, non-invasive diagnostic test that detects active Helicobacter pylori infection by measuring the urease activity of the bacterium in the stomach 1, 2
The UBT is primarily used to diagnose active H. pylori infection, which is associated with peptic ulcer disease, chronic gastritis, and gastric malignancies 3, 4
UBT is part of the "test and treat" strategy recommended for young (<50 years) dyspeptic patients without alarm symptoms, reducing the need for invasive endoscopy 5, 6

The UBT has excellent diagnostic accuracy with sensitivity of 94.7-97% and specificity of 95-95.7% 1, 2
It is considered superior to serological tests, which only indicate past exposure rather than active infection 7
The UBT is comparable in accuracy to the stool antigen test, which is another non-invasive option for detecting active infection 5, 8
False negative results can occur if the patient has recently taken antibiotics, bismuth products, or proton pump inhibitors 7, 8
False positive results may occur in patients with achlorhydria or atrophic gastritis due to urease-producing non-H. pylori organisms 8

For optimal accuracy, patients should fast for at least 6 hours before the test 7
The American College of Cardiology recommends that patients with suspected H. pylori infection undergo UBT to confirm the diagnosis 7
The UBT results can help guide clinical decisions regarding the need for further investigation or treatment, as recommended by the European Society for Clinical Microbiology and Infectious Diseases 3, 5, 6