Detection of Upper Gastrointestinal (GI) Bleeding Using a Novel Bleeding Sensor Capsule -Healthy Volunteers Study

Inclusion Criteria: 1. Age 18 -60 years 2. Ability to give written informed consent Exclusion Criteria: 1. Circulatory or hemodynamic instability with a clear need for urgent endoscopy or surgery (systolic blood pressure \<100 mmHg,heart rate \> 100 / min) 2. Known current stenosis of the GI tract 3. Presence of pacemaker or other implantable electronic device 4. Dysphagia or difficulties in swallowing pills the size of the capsule 5. History of achalasia or known esophageal dysmotility 6. History of gastroparesis 7. History of severe constipation (1 bowel movement per week or less) 8. Healthy volunteers who are currently pregnant or breastfeeding, or intend to become pregnant during the investigation 9. Active psychological issues preventing participation 10. Stomach bezoar 11. History of severe esophagitis 12. History of Crohn disease 13. History of diverticulitis 14. History of bowel obstruction 15. Suspected gastrointestinal tumor disease 16. Planned MRI investigation (MRI needed before the capsule is excreted)