The DMSA renal scan is a nuclear medicine test that gives detailed pictures of the kidneys. DMSA (dimercapto succinic acid) is a short-lived radioisotope that goes directly to the kidneys once inside the body and only stays radioactive for a few hours. Using DMSA and a special camera, nuclear medicine doctors can see the kidneys and diagnose problems at their earliest stages. Although a bit different from traditional X-Rays, and CT scans, nuclear medicine tests using radioisotopes like DMSA have about the same amount of radiation as other radiology tests.
Before the test begins, a pediatric radiology nurse will place an intravenous (IV) line in your child’s arm, hand or foot. A tiny amount of the DMSA will be given through the IV, based on your child’s weight. Although the DMSA is completely safe and will not hurt your child, he or she might be a bit uncomfortable for a moment when the IV is first placed.
- Nuclear medicine tests work through the use of a small amount of radioactive material called a radioisotope. The radioisotope is safe and will not hurt your child.
- The DMSA scan itself does not hurt, but an intravenous (IV) line is needed to give a tiny amount of the radioisotope before the test.
- Most children are able to lie perfectly still for the test; young children may even nap through the test.
- In rare cases, when a child is unable to stay still for the test, sedation medication may be needed to help him or her sleep during the test.
- When sedation medication is prescribed, there are important rules for eating and drinking that must be followed in the hours before the test.
- A supervising pediatric radiology doctor is always nearby when sedation medication is given.
- The DMSA injection is given through the IV. It takes 90 minutes for the DMSA to be absorbed by your child’s kidneys.
- If your child is not having sedation, the IV will be removed after the DMSA injection is given.
- If your child is having sedation, the IV may stay in place until it is time for the DMSA scan and may be used to give your child the sedation medication.
- You and your child will be allowed to leave the department during the 90 minutes after the DMSA injection. If he or she is not having sedation, you may feed your child during that time.
- If sedation medication has been prescribed for your child, please do not give him or her anything to eat or drink until after the scan has been done.
- During the 90 minute wait time, we ask that you to try to keep him or her awake so he or she will be tired and eager to nap when the pictures need to be taken.
- After the 90 minutes, when the DMSA has been absorbed, detailed pictures will be taken of the size, shape and position of the kidneys.
- No special preparation is needed, and your child may eat and drink as usual unless sedation medication has been prescribed for your child.
- Have your child wear comfortable, loose-fitting clothes on the day of the test.
- You may want to bring along a "comfort item"—such as a favorite stuffed animal or "blankie"—for your child to hold during the test.
- You can bring along a portable music or movie player to distract your child so that he or she can lie completely still during the pictures.
- For toddlers and preschool-age children, the best time to talk with your child is right before the test. On the day of the test, tell your child that he or she will be having some "pictures" taken, so the doctor can help him or her feel better. Most children this age are afraid of being separated from their parents. Let your child know that you will stay with him or her the whole time.
- School-age children have good imaginations and may frighten themselves by imagining something much worse than the actual test. The day before the test, tell your child that he or she is going to the hospital to have some pictures taken of his or her kidneys. Be honest and tell your child exactly what will happen. Let your child ask questions about the test.
The DMSA scan is done at all branches of City X-Ray and Scan Clinic.
A pediatric radiology nurse will put in the IV and give the DMSA injection. You and your child may leave the department or stay in the radiology waiting area for the next 90 minutes.
You will be given a specific time to return to the Department of Pediatric Radiology. When you return, you and your child will be taken to a nuclear medicine room. Inside the room will be a nuclear medicine technologist who will do the DMSA scan, a table and a nuclear medicine camera. The lights will be dim inside the room.
- Your child will lie down on the table.
- The technologist may place a Velcro strap across your child’s waist or use a papoose board to help him or her stay still.
- During the scan, the camera will either move over your child’s body or stay in one position, but will not touch your child at any point. The scan itself does not hurt.
- The technologist will remain in the room for most of the test; you will be able to stay with your child the whole time.
- Each picture of the kidney takes about 8 minutes; all of the pictures will be done in about 60 minutes.
- If your child received sedation medication for relaxation or sleep, he or she will be taken to the recovery area to be watched until the medication wears off and he or she is awake again.
After The Test
Once a nuclear medicine doctor approves the quality of the pictures, the test will be over. A report of your child’s scan will be sent to the doctor who ordered it, usually within 48 hours. If there are any urgent results to report, your doctor will be contacted immediately.
- Please contact the doctor who ordered the scan for the results.
- If your child did not receive sedation, no special follow-up care is necessary; he or she may resume normal activities and diet.