Women in the other group will return to the office in 2-4 days and will undergo a voiding trial via retrograde fill with 10 ounces (300 mL) of normal saline or until your bladder capacity is reached. This means that a catheter will be inserted in your urethra and normal saline will be put in your bladder via a large syringe that acts as a funnel. You would be considered to have failed the voiding trial and be taught clean intermittent self-catheterization if you do not void 5 ounces (150 mL) within an hour or you become too uncomfortable with the bladder fullness, and your postvoid residual volume is greater than 150 mL. The residual volume is determined by a portable ultrasound like machine via an external probe which is scanned over your lower pelvic area.