Final answer:
A VCUG is performed to identify structural abnormalities predisposing to UTIs by injecting contrast dye into the bladder and taking X-rays or fluoroscopic images while the patient urinates.
Step-by-step explanation:
VCUG stands for Voiding Cystourethrogram, and it is a diagnostic imaging test used to identify structural abnormalities that may predispose to urinary tract infections (UTIs). It is commonly performed in pediatric patients with recurrent UTIs or those with atypical symptoms.
The test involves injecting a contrast dye into the bladder through a catheter and then taking X-rays or fluoroscopic images while the patient urinates. The dye helps visualize the structure of the bladder and urethra, allowing the doctor to identify any abnormalities that may be causing the UTIs.