Voiding cystourethrography (VCUG) is best described as which procedure?

• A. Ultrasound imaging of the bladder during voiding.
• B. X-ray performed after injecting dye into the bloodstream to visualize the urinary tract.
• C. MRI imaging of the pelvis during urination.
• D. X-ray performed while the patient voids with dye placed in the bladder through the urethra.

Answer: (D)

Voiding cystourethrography uses fluoroscopic X-ray imaging while the bladder is being emptied, with radiographic contrast placed into the bladder through a catheter. This setup lets you see the step-by-step flow of urine, the bladder outlet and urethra, and whether contrast refluxes up into the ureters during urination. It’s the real-time visualization during voiding that distinguishes it from ultrasound during voiding, intravenous contrast studies, or MRI-based voiding imaging.