30th April 2024

A 65-year-old woman presents with a 6-month history of urinary incontinence.

A 65-year-old woman presents with a 6-month history of urinary incontinence. She describes a sudden, intense urge to urinate followed by involuntary loss of urine, especially when she hears running water. She denies any pain, haematuria, or history of urinary tract infections. She has no significant past medical or surgical history. Her physical examination, including a pelvic exam, is unremarkable.

Investigations:

Urinalysis: Normal

Post-void residual measurement: 50 mL

Empty supine stress test: Negative

Which investigation is most likely to confirm the diagnosis?