Why is it done?

• Long-standing constipation
• Difficulty passing stool despite treatment
• Suspected slow bowel movement (slow transit constipation)
• To differentiate types of constipation (e.g., slow transit vs outlet obstruction)
• Evaluation before specialized treatments or surgery

How is the test performed?

• The most common method involves swallowing small capsules containing tiny markers visible on X-ray
• You will swallow the capsule(s) on specific days
• X-ray images are taken after a few days to track the movement of markers in your colon
• The test usually takes 3–5 days (sometimes longer depending on protocol)

Is it painful?

No. This test is completely painless and non-invasive.

How should I prepare?

• Follow your doctor's instructions carefully
• You may be asked to stop laxatives or certain medications before and during the test
• Maintain your usual diet unless advised otherwise

What do the results show?

• Whether stool movement through the colon is normal or slow
• Whether the problem is due to poor colonic motility or difficulty in evacuation
• The pattern of marker distribution in the colon

What happens after the test?

• You can resume normal activities during the study
• After completion, your doctor will review the X-rays and plan further management

Is it safe?

Yes. The test is very safe. It involves minimal radiation exposure from X-rays.