Radionuclide Cystogram

Also known as: RNC, nuclear medicine cystogram

What is a Radionuclide Cystogram?

A cystogram is a nuclear medicine study to check for any possible causes of a urinary tract infection (UTI), or to determine if the child has Vesicoureteral Reflux (VUR), which is when urine flows backwards from the bladder and instead flows towards the kidneys. This type of radiological exam utilizes a minimal and safe amount of a radiopharmaceutical to obtain a detailed picture of the part of the body.

What to Expect During the Procedure

Step 1: Getting Ready

Your child will be given a small radiopharmaceutical through a soft, plastic catheter that is gently inserted into his or her bladder.

To get ready for the plastic catheter, your child will be asked to remove all clothing (including undergarments) and change into a hospital gown.

• A table with a camera attached underneath will be inside the room (“camera bed”). The camera never moves and never touches the child.  The technologist will then ask you to help your child lie down on the “camera bed” to prepare for the pictures.
• A member of the medical team will then begin to clean the area where your child urinates. When cleaning the area, they will use soft cotton balls and a soap called “Betadine” (brown soap).
  • Girls will be asked to make “frog legs”, “butterfly wings” or “ballerina legs” (feet together, knees apart while lying down) so that the area can be properly cleaned.
  • Some children say this part feels cold.

• Next, a lubricated catheter (small, plastic tube covered with jelly) will then be placed as gently as possible into the child’s bladder and taped in place.
  • Your child may feel pressure and or the need to urinate during this time.
  • Encourage your child to take deep breaths to make the catheter insertion easier for the child.

---

Reviewed by: Felix I Ramirez-Seijas, MD

This page was last updated on: September 16, 2025 12:42 PM