Which test is used to evaluate nerve and muscle function of the bladder?

• A. Urodynamic testing
• B. Ultrasound evaluation of the bladder
• C. MRI pelvis
• D. CT urography

Answer: (A)

Assessing how the bladder nerves and muscles function is done with urodynamic testing. This set of tests measures bladder pressures and urine flow to see how well the detrusor muscle contracts and how the outlet and sphincter coordinate during filling and voiding. Key components include filling cystometry, which tracks pressure and sensation as the bladder fills; and pressure-flow studies, which analyze detrusor pressure during voiding and the urine flow rate to identify obstruction versus underactive contraction. Electromyography of the pelvic floor muscles may be used to evaluate nerve signals to the external sphincter. Together, these data reveal problems such as detrusor overactivity, detrusor underactivity, poor bladder compliance, outlet obstruction, or detrusor-sphincter dyssynergia, which are crucial for diagnosing neurogenic or other forms of bladder dysfunction and guiding treatment.

Imaging tests like ultrasound, MRI of the pelvis, or CT urography focus on anatomy and structural issues; they don’t assess the functional nerve-muscle performance of the bladder itself, though they can complement the evaluation.