Postvoided Residual/Bladder Emptying: A Mini Review

Postvoid residual (PVR) urine volume is widely used in the evaluation of patients with lower urinary tract symptoms (LUTS) and benign prostatic obstruction (BPO), yet its clinical role remains debated. This mini review critically appraises current evidence on the definition, pathophysiology, measurement, and clinical utility of PVR. PVR reflects impaired bladder emptying and is influenced by multiple mechanisms, including bladder outlet obstruction, detrusor underactivity, and altered sensory function. However, its diagnostic accuracy for identifying specific conditions is limited by high interindividual variability, lack of standardized cutoffs, and weak diagnostic accuracy for any specific condition. Recently, the PVR ratio has been introduced and may overcome the diagnostic limitations of PVR. Clinically, PVR is useful for monitoring medical and surgical treatment outcomes and disease. Overall, PVR should be interpreted as a dynamic parameter within a broader clinical and urodynamic assessment framework. PATIENT SUMMARY: We reviewed how physician use a simple test that measures how much urine remains in the bladder after voiding. We found that this test alone is not very reliable for diagnosing the cause of urinary symptoms, but it can still be helpful in monitoring how patients respond to treatment. Overall, it should be used together with other clinical assessments rather than on its own.