When using a portable ultrasound bladder scanner to measure post-void residual volume, which action is correct?

When using a portable ultrasound bladder scanner to measure post-void residual volume, which action is correct?

• A. Have a client urinate 20 min before the scan
• B. Assist the client into a semi-Fowler9s position
• C. Position the scanner head at the symphysis pubis
• D. Apply light pressure to the scanner head once it is in position

Answer: (D)

When measuring post-void residual volume with a bladder scanner, the key is to get reliable ultrasound contact with the bladder without compressing it. The bladder sits just behind the pubic symphysis, so place the scanner head on the lower abdomen just above the pubic bone. Then apply only light pressure to maintain good skin contact and minimize air gaps; pressing too firmly can compress the bladder and falsely reduce the measured residual volume. After voiding, this gentle contact yields a more accurate reading. The other actions don’t support accurate measurement: waiting 20 minutes after voiding can allow refilling and change the residual, a semi-Fowler’s position isn’t necessary for this measurement, and placing the head directly at the pubic symphysis can impede proper contact with the bladder region.

When measuring post-void residual volume with a bladder scanner, the key is to get reliable ultrasound contact with the bladder without compressing it. The bladder sits just behind the pubic symphysis, so place the scanner head on the lower abdomen just above the pubic bone. Then apply only light pressure to maintain good skin contact and minimize air gaps; pressing too firmly can compress the bladder and falsely reduce the measured residual volume. After voiding, this gentle contact yields a more accurate reading. The other actions don’t support accurate measurement: waiting 20 minutes after voiding can allow refilling and change the residual, a semi-Fowler’s position isn’t necessary for this measurement, and placing the head directly at the pubic symphysis can impede proper contact with the bladder region.