A Meckel scan is an imaging test used to detect a Meckel diverticulum. This is a small, abnormal pocket that forms in the wall of your child’s small intestine. It's the most common problem of the digestive tract that a child is born with (congenital).
During normal development of the digestive tract, a small duct forms off an area of what will become the small intestine. Normally, the body gets rid of this duct very early in development of the embryo, but occasionally it doesn’t. This results in a small pouch or pocket that extends off part of the small intestine. This pouch is called a Meckel diverticulum. The Meckel diverticulum often contains the same tissue as that of the stomach or pancreas. It may cause bleeding.
A Meckel scan can help find this abnormal tissue. Your child will get something called Technetium-99m through a vein. This substance has a tiny amount of radioactive material in it. Pieces of your child's stomach tissue absorb most of this substance. A special camera called a gamma camera can see the radiation and use it to take a series of pictures of your child’s abdomen. The camera will show if this material appears in a Meckel diverticulum.
Your child will usually be awake and alert during the imaging procedure. Then, a radiologist can analyze the series of images. If the camera doesn’t pick up any radiation from the small intestine, your child probably doesn’t have a Meckel diverticulum.
Many children and adults with a Meckel diverticulum never have any symptoms from it. Your child might need a Meckel scan if he or she has symptoms such as pain in the belly or blood in the stool. Your child’s doctor might recommend a Meckel scan if other tests such as a standard X-ray haven’t found the cause of your child’s bleeding. A Meckel scan is often a good next step toward finding the source of the bleeding. The scan doesn’t find other reasons for digestive bleeds, but it can usually find a Meckel diverticulum. Your child's healthcare provider may also advise a capsule endoscopy. For that test, the child swallows a small capsule that takes pictures as it goes through your child's intestines.
A Meckel scan is very safe. Risks are very minimal. They include having a little bleeding at the IV insertion site.
A Meckel scan does use radiation, but only a tiny dose, about the same as a chest X-ray. In high doses, radiation is quite dangerous and increases the risk for cancer. The amount of radiation from a single Meckel scan is so small that it probably does not really increase your child’s risk for future cancer. If it does, it does so by only an incredibly small amount.
Your child's doctor will only recommend a Meckel scan if the risks of not getting a scan outweigh any possible risks from radiation. Talk with the doctor about all of your concerns about the procedure.
Your child's doctor will talk with you about how to get your child ready for a Meckel scan. It’s important to talk with your child. Give a simple explanation about why the scan is needed. Explain that it is important to stay as still as possible during the scan. You can assure your child that you will be nearby during the entire test, even if you can't be in the same room.
You may want to bring a favorite book or toy to use while your child is having the scan. Most hospitals also have DVD players.
Tell the doctor about any new symptoms your child has, such as a recent fever. Continue to give your child any medicines he or she normally takes, unless the doctor gives you different instructions. In some cases, the doctor might prescribe a type of medicine called an H2 blocker for a day or two before the procedure. This may help your technician get a clearer image.
Your child can't have any medical studies that involve barium within 48 hours before the test. Your child should also not eat or drink anything for 4 to 6 hours before the scan. You might want to bring a snack or drink that your child can have right after the exam.
Here are some things you might expect to happen during your child’s Meckel scan. The entire scan should take about 30 to 60 minutes.
Typically, doctors don’t use sedation during the procedure, so your child should be awake. Let the doctor know ahead of time if you think this might be a problem.
Someone will place an IV into your child’s arm, hand, or foot. Your child will feel a small pinch, but it should not be painful.
Your child will lie down on the exam table. Someone will place a camera above the table. It will come very close, but it won’t touch your child.
Someone will start the radiotracer flowing through the IV line. The imaging will start from this point. It will not hurt.
Ask the doctor if there is anything else you should expect during your child’s Meckel scan.
Typically, your child won’t need to follow any specific instructions after a Meckel scan. You and your child should be able to go home very soon after the scan.
A radiologist usually assesses your child’s scan that same day. The radiologist will send a report of the scan to your child’s doctor. Talk with the doctor about how and when you can expect to get the results of your child’s Meckel scan.
The scan may show that your child has a Meckel diverticulum. If so, your child may need surgery to repair it. If the scan does not show that your child has a Meckel diverticulum, the doctor might order more imaging tests such as a CT angiography. These will be done to find the source of your child’s bleeding.
Meckel scans are not perfect. In a few cases, they don’t identify children who actually do have a Meckel diverticulum. And sometimes they identify children who don't really have a Meckel diverticulum. In other words, the Meckel scan only give one piece of information that helps guide your child’s diagnosis and treatment.
Keep all future appointments and follow all of the doctor’s instructions about managing your child’s condition.
Before you agree to the test or the procedure for your child make sure you know:
The name of the test or procedure
The reason your child is having the test or procedure
What results to expect and what they mean
The risks and benefits of the test or procedure
When and where your child is to have the test or procedure
Who will do the procedure and what that person’s qualifications are
What would happen if your child did not have the test or procedure
Any alternative tests or procedures to think about
When and how you will get the results
Who to call after the test or procedure if you have questions or your child has problems
How much you will have to pay for the test or procedure