 [ Symptoms ] is there any contraindication in administering a helicobacter pylor urea breath test to a pregnant women [ Disease ] there is no need to administer a urea breath test to a pregnant woman the presence or absence of h pylori can be determined accurately from a sample of stool there are two types of urea breath tests for diagnosing h pylori one uses a very small dose of urea that is labelled with a radioactive isotope of carbon and the other uses urea that is labelled with a non radioactive isotope of carbon the non radioactive isotope has no adverse effects the radioactive isotope is not recommended for use in pregnant women