What is a colon transit study?
A colon transit study checks how fast stool moves through your large intestine (colon). It is used to understand why chronic constipation is happening — whether the colon is moving too slowly, or the problem lies elsewhere.
Why is this test done?
Dr. Gattani may recommend this test if chronic constipation hasn't improved with basic dietary changes or medicines, to check whether the colon's movement (motility) is the cause.
How to prepare
- Stop laxatives and other medicines that affect bowel movement a few days before, as instructed
- Continue your normal diet unless told otherwise
What happens during the test
You will swallow a capsule containing small markers that show up on X-ray. You continue your normal diet and activities over the following days. On a set day — commonly day 5 — an X-ray is taken to see how many markers remain in the colon and where they are located.
What happens after the test
There is no recovery time needed. The markers pass naturally in stool over time.
Is this test safe?
Yes. It uses a low dose of X-ray radiation and does not require sedation or needles.
Frequently asked questions
No. It only involves swallowing a capsule and having an X-ray — there is no discomfort involved.
The test usually spans about 5 to 7 days, with the X-ray taken on a specific day as advised by Dr. Gattani.
Yes, unless your doctor gives specific instructions otherwise.
Results are available once the X-ray is reviewed, usually the same day as the scan.