Which test is NOT commonly included in a standard urodynamic evaluation?

• A. Filling cystometry
• B. Pressure-flow study
• C. Uroflowmetry
• D. CT urography

Answer: (D)

Urodynamic testing is all about how the bladder stores and empties urine, using functional measurements rather than mainly anatomical pictures. Filling cystometry tracks bladder pressure as the bladder fills, revealing how the detrusor muscle behaves, what the bladder capacity is, and whether there’s overactivity or poor compliance. A pressure-flow study examines pressures during voiding and how they relate to the actual urine flow, helping to identify obstruction or weak detrusor contractions. Uroflowmetry simply measures the rate and pattern of urine flow during voiding to assess how smoothly the bladder can empty.

CT urography, by contrast, is an imaging study that provides detailed pictures of the anatomy of the kidneys, ureters, and bladder. It shows structural issues like stones, tumors, or anatomical obstructions but does not measure the functional dynamics of storage and voiding. Because the standard urodynamic evaluation focuses on function, not structure, CT urography is not routinely included. It may be used separately when structural concerns are suspected or when planning treatment, but it isn’t part of the typical urodynamic test battery.