Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Vesicoureteral Reflux ?
    ### Response:
    The most common tests used to diagnose VUR include
                
- Voiding cystourethrogram (VCUG). VCUG is an x-ray image of the bladder and urethra taken during urination, also called voiding. The bladder and urethra are filled with a special dye, called contrast medium, to make the urethra clearly visible.
    