How To Catheterize the Bladder in a Male Child By Keara N DeCotiis, MD, Nemours / Alfred I duPont Hospital for Children Reviewed / Revised Dec 2020 | Modified Sep 2022 View Patient Education Indications Contraindications Complications Equipment Additional Considerations Relevant Anatomy Positioning Step-by-Step Description of Procedure Aftercare Warnings and Common Errors Tips and Tricks Urethral catheterization is insertion of a flexible catheter through the urethra into the urinary bladder.