INCLUSION/EXCLUSION We have made every effort to enable the study to be open to a wide range of patients however we have currently limited the study to patients with upper gastrointestinal bleeding to allow the highest possibility for pathology detection for either endoscopic modality and hence facilitate comparison of diagnostic ability. Specific considerations have been made to ensure that patients will be excluded from the study if there is to be any delay/interference to the standard management of upper gastroinstinal bleeding.