What is a renal Mag3 scan?

A renal Mag3 scan is a procedure that shows how well your child’s kidneys, ureters, and bladder are working. This scan is done in the nuclear medicine department.

Why is my child having a renal Mag3 scan?

A renal Mag3 scan is conducted to detect hydronephrosis (urine backing up into the kidneys), ureteropelvic or ureterovesical obstruction (narrowing of the ureter), distention of pelvocalyceal system, and may be needed for a post-surgical evaluation. It can be used to detect renal function, detect acute tubular necrosis, and evaluate for renal trauma.

What preparation is needed for my child's renal Mag3 scan?

• Your child will be brought back to the imaging area and will be asked to change into a hospital gown.

• Your child will need to have an IV placed. Fluids will be administered through the IV immediately before the exam and infuse slowly until the required amount has been given.

• In some cases, a Foley catheter is needed and is inserted in the bladder to keep the bladder empty during the scan.

• The technologist will inject a trace amount of radioactive material called Mag 3 through the IV and begin the scan.

• Imaging takes approximately 20 minutes to complete.

• After 20 minutes, a diuretic (Lasix®) is administered through the IV site to help the kidneys produce more urine during a short period of time, which will help to see how the kidneys function.

• After the scan is completed, the IV and Foley catheter (if used) will be removed.

What happens after my child's renal Mag3 scan is finished?

• If your child is an outpatient and no other tests or appointments are scheduled, you and your child can go home.

• There are no restrictions to activities or food and drink after the exam.

What can I do to help put my child more at ease during his or her renal Mag3 scan?

• It is important that your child feels at ease during this test.

• Parents can practice holding still with the children the night before the test. This can help them feel more secure when they are asked to do this during the test.

• A “comfort” item from home is a good way to help your child feel comfortable while at the hospital.