The price of the Carbon 14 Urea Breath Test ranges from$80-$135, and pricing can vary because each hospital and each region is different. The carbon 14 urea breath test is one of the most common tests performed in gastroenterology to check for Helicobacter pylori. In addition to the carbon 14 urea breath test, a carbon 13 urea breath test can also be performed. The difference between carbon 13 and carbon 14 is that carbon 14 is radioactive while carbon 13 is not, and carbon 13 is more widely available. The carbon 14 breath test is contraindicated for women of childbearing age or children. When H. pylori testing is required, pregnant women, infants and children or women of childbearing age can choose the carbon 13 breath test.