Each day in the United States, approximately 9 people are killed and more than 1,000 injured in crashes that are reported to involve a distracted driver. 1 Distracted driving is driving while doing another activity that takes your attention away from driving.
This is called the post-void residual. The bladder has a approximately 500ml capacity. You should feel a desire to void at ~250ml. Urinary retention is measured by using a special type of ultrasound (bladder scan), or by inserting a bladder catheter and measuring how much urine comes out. I'm a 4th year US med student. On one of my urology rotation I asked the Sr. resident this exact question.
Normally you will feel the urge to void when the bladder contains about 8 to 10 ounces of urine, about as much fluid as in a can of soda. There really are no ânormalâ voiding patterns. Patterns which do exist range from every 4 to 6 hours to every 6 to 8 hours. Seniors over 65 may void every 3 to 4 hours and at least once during the night. After voiding there should be around 3 ounces left in the bladder.