Helicobacter Pylori is a bacterium whose activity is the cause of ulcer in the human stomach, a well known risk factor of gastric cancer. The standardized hospital protocol for its detection is the "13C Urea Breath Test" (UBT), which consists in detecting isotope-marked carbon dioxide in a breath sample of a patient that has previously ingested a pill containing marked urea. If bacteria are present, urea gets digested producing marked carbon dioxide, which is then expired by the person. The presence of such Volatile Organic Compound within the sample is then analysed by a mass spectrometer, such as the ones provided by NanoTech Analysis S.r.l.