Patient Portal. Patient Information. ... Preventing this disease is our driving passion at Salem Gastro. The American Society for Gastrointestinal Endoscopy is a reliable source for information regarding Colonoscopy, what we do here and why. ... Salem, Oregon 97301 (503) 399-7520.Contact/Directions‧Our Providers‧Patient Information‧Salem Gastro‧Salem Endoscopy‧Telehealth Visits.