What is the purpose of a bladder diary?

• A. To measure urine osmolality
• B. To quantify voiding patterns and leakage
• C. To assess renal function
• D. To evaluate bladder capacity via imaging

Answer: (B)

A bladder diary is used to capture real-world bladder habits over a few days to quantify what the patient is experiencing. By recording each bathroom visit, approximate voided volume, any leakage or strong urge, the timing of nocturnal voids, and fluid intake, the diary turns symptoms into measurable patterns. This helps show how often the person voids, how much urine is typically produced, and when leakage occurs, which is crucial for distinguishing between urge, stress, or mixed incontinence and for guiding treatment decisions. It also lets clinicians monitor changes over time to see if interventions are helping. It isn’t a test of urine osmolality, renal function, or bladder capacity via imaging, which rely on lab tests or imaging studies rather than daily symptom tracking.