Q: What is the acceptable postvoid residual (PVR) volume?

A) none

B) less than 30 cc

C) 50 cc

D) 100 cc

E) less than 200 cc

Answer:  D

In ICU, a bladder scan is a preferred method instead of "straight cath" (an invasive “in and out”  urinary catheterization) to assess postvoid residual (PVR) volume, which shouldn't be higher than 100 mL.  Scan should be typically performed 10 minutes after a patient has last voided.

"Straight Cath." should be avoided as it is an invasive “in and out” urinary catheterization, which can be uncomfortable. Moreover, pose a direct risk of trauma and infection.