Colon Transit Markers have been widely used in various forms for many years. There are various different test protocols, some users simply purchase low grade radiopaque shapes and perform in house studies on Colon Transit. Both test types comprise of high quality radiopaque markers encapsulated and packaged in foil bubble wrap. The tests are fully CE marked and supplied as consistent high quality products with a shelf life of five years. Both test types are now widely used in hospitals throughout the UK.