Abstract
Patency capsule (PC) is a frequent initial study in patients with a perceived risk of retained study video capsule endoscopy (VCE). PC has no video capabilities, is the exact dimensions of the VCE but, starts to disintegrate at 30 hours if still present in the body. Its use involves abdominal xray (KUB) performed 24 and/ or 30 hours post PC ingestion. If there is evidence that PC has traversed the small bowel a VCE is then performed.
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