| Interventions |
1. Investigation of the sensitivity and specificity of CalproQuest for stool Calprotectin levels = 50 mg/g feces and for positive IBD diagnosis: Patients referred to the gastroenterologist for endoscopic examination are subjected to CalproQuest and Calprotectin stool testing prior endoscopy. At baseline T0, patients will be subjected to CalproQuest. Subsequently, at T1 fecal samples will be obtained to measure Calprotectin levels. The patients themselves will perform collection of the fecal specimens. The fecal specimens from outpatients will be shipped to the laboratory at the University Hospital Zurich by mail. After measurement, fecal samples will be disposed according to current guidelines. At T2, endoscopic examination will be performed to obtain a diagnosis. Eventually, patients diagnosed with IBD will be asked to complete a questionnaire at T3 investigating duration of first onset of symptoms to IBD diagnosis (diagnostic delay). 2. Investigation of feasibility of CalproQuest in daily primary care practice Patients with on-going unspecific gastrointestinal symptoms (abdominal pain, bloating, stool irregularities, diarrhea) for more than two weeks presenting at the GP will be included into the study if all inclusion criteria are met and informed patient consent is obtained. At baseline (T0), patients will be subjected to CalproQuest. Subsequently, at T1 fecal samples will be obtained to measure Calprotectin levels. The patients themselves will perform collection of the fecal specimens. The fecal specimens will be shipped to the laboratory at the University Hospital Zurich by mail. After measurement, fecal samples will be disposed according to current guidelines. According to the current standard of ca |