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You are seeing a 5 year old boy with abdominal pain. His parents say that he has not been eating solids, but has been taking in liquids all day, yet he has not urinated.
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February 15, 2022 at 10:51 pm
B) > 20 mL
More than 20mL post-void residual (PVR) is abnormal in children. Most adults empty their bladder to 200 mL PVR in an adult is clearly abnormal. Catheterization after a void is the gold standard for measuring PVR. However, Ultrasound calculation of bladder volume after a void is often used to estimate PVR. The differential for abnormal PVR is broad, including neurogenic causes, anatomic blockages, medication related, and urine withholding secondary to pain.