Bladder function is assessed with which procedure?

• A. Cystometry
• B. Uroflowmetry
• C. Pressure-flow study
• D. Renal scan

Answer: (A)

Bladder function is evaluated by observing how the bladder stores urine and how it empties. Cystometry involves filling the bladder with fluid through a catheter and recording pressures inside the bladder (intravesical pressure) and the detrusor pressure, along with bladder capacity, compliance, and sensations as it fills. This test reveals how the bladder stores urine—whether there are involuntary contractions, how easily it stretches (compliance), and what happens to pressure with filling and with leaks. That information directly reflects bladder storage function and detrusor behavior, making it the best test to assess overall bladder function.

Uroflowmetry, in contrast, measures the rate of urine flow during voiding but doesn’t provide data on bladder pressure or storage dynamics. A pressure-flow study adds pressure measurement during voiding and is often used to evaluate outlet obstruction, usually combined with cystometry. A renal scan looks at kidney structure and function, not the bladder's storage or emptying mechanics.

So, for assessing how the bladder stores and releases urine, cystometry is the appropriate procedure.