The physician orders a patient with a duodenal ulcer to take a UREA breath test. Which lab value will the test measure to determine if H. pylori is present?

A. Hydrochloric Acid: This is stomach acid, not measured in the urea breath test. B. Carbon Dioxide: If H. pylori is present, it breaks down urea and releases carbon dioxide, which is measured in the breath. C. Ammonia: Ammonia is a byproduct but is not the main measurement in the urea breath test. D. Potassium: Potassium is unrelated to H. pylori testing.