What is the best urine collection method to assess patency of the urethra?

What is the best urine collection method to assess patency of the urethra?

• A. Cystocentesis
• B. Manual expression
• C. Free catch
• D. Catheterization

Answer: (D)

Testing whether urine can pass through the urethra. To assess patency, you directly try to pass a sterile urinary catheter from the urethral opening into the bladder. If the catheter advances with little resistance, the urethra is open (patent). If you encounter significant resistance or cannot advance the catheter, there is an obstruction or stricture, indicating impaired patency. Cystocentesis bypasses the urethra entirely, so it doesn’t tell you anything about whether the urethra is open. Free catch relies on the animal’s ability to void and can be normal even with partial obstruction, plus it’s susceptible to contamination. Manual expression may not reliably produce urine and doesn’t test the urethra’s lumen. Therefore, catheterization provides the direct, practical assessment of urethral patency.

Testing whether urine can pass through the urethra. To assess patency, you directly try to pass a sterile urinary catheter from the urethral opening into the bladder. If the catheter advances with little resistance, the urethra is open (patent). If you encounter significant resistance or cannot advance the catheter, there is an obstruction or stricture, indicating impaired patency.

Cystocentesis bypasses the urethra entirely, so it doesn’t tell you anything about whether the urethra is open. Free catch relies on the animal’s ability to void and can be normal even with partial obstruction, plus it’s susceptible to contamination. Manual expression may not reliably produce urine and doesn’t test the urethra’s lumen. Therefore, catheterization provides the direct, practical assessment of urethral patency.