Gastroscopy is a procedure to examine the stomach and the large intestine. The express method to test the bacteria (Helicobacter pylori) in the mucous tissue of the stomach and the FOBT test (faecal occult blood test) are available. FOBT test helps to diagnose the early stage of cancer in the large intestine, the patient gets the result in 10 minutes. Timely diagnoses and treatment decrease the mortality from intestine cancer up to 30 %. It is recommended to people who have problems with the digestive system and as screening measurement of people over 40-years of age, whose relatives have had the cancer of intestine.