The urea breath test usually takes about 1.5 hours. If the results are positive, this means that H.pylori is present in the patient's stomach. The degree of infection is measured after calculating the measurements between the pre and post urea testing.
The sensitivity and specificity of the breath test ranges from 94% to 98%. Principle behind urea breath test. Fecal antigen test (FAT): H. pylori stool antigen is a reliable noninvasive tool to screen H. pylori infection.