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Definition Return to top
Bowel transit time refers to how long it takes for the food to move from the mouth to the anus.
This article discusses the medical test used to determine bowel transit time.
How the Test is Performed Return to top
You will be asked to swallow two gelatin capsules filled with carmine red or another food dye. You take the special capsules with a meal.
Afterwards, you observe your bowel movements and write down how long it takes for the colored dye to first appear. You'll also need to note how long it takes for the color to disappear from the stools.
How to Prepare for the Test Return to top
No preparation is usually needed. However, you should follow any diet or other directions from the health care provider.
How the Test Will Feel Return to top
You will not feel the capsules move through your gastrointestinal system.
Why the Test is Performed Return to top
The test helps determine bowel function.
Your doctor may ask you to record transit times you introduce fiber into your diet. Your diet affects the bowel transit time. For example, if you eat a lot of foods rich in fiber (whole grains, vegetables, and fruits), you have a more rapid transit time and a heavier, bulkier stool.
Normal Results Return to top
The bowel transit time varies even in the same person. The first of the color should appear in the stool about 12 - 14 hours after it is taken. The last of the color will appear within 36 - 48 hours.
What Abnormal Results Mean Return to top
If the times are much longer, 72 hours or more, it may indicate a slowed bowel function. A high fiber diet should speed the bowel transit time up.
Risks Return to top
There are no risks.
Considerations Return to top
The bowel transit time dye test is rarely performed these days.Update Date: 8/22/2008 Updated by: Christian Stone, MD, Division of Gastroenterology, Washington University in St. Louis School of Medicine, St. Louis, MO. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.