Normal colon transit time
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24 radio-opaque markers are swallowed and abdominal x-rays are taken 1 hour, 24 hours, 48 hours, 72 hours, 96 hours and 120 hours later. None of the markers are seen after 120 hours, indicating that there is no slow transit constipation.
There are numerous variations in how a colonic transit study is conducted and how the findings are interpreted. In this case, 24 markers are ingested and abdominal x-rays taken 1, 24, 48 and 72 hours later. If 24 rings are used, then <5 rings should be present in five days.