Yes. You swallow a little capsule that has a computer chip inside. You wear a transmitter. I believe it was for 3 days. So many days prior and during you cannot use anything that could affect motility such as fiber, Imodium, laxatives, etc. you have a little diary where you write down if you have any symptoms, if you have pain, have a BM, sleep, etc. You return the transmitter and at some point will poop out the capsule. The results determine how long it takes the capsule to navigate through your entire digestive system. I think it measures other things, too. It showed that I have slow transit/slow motility which is why I am always constipated. They then can better treat you.