What is the post-void residual volume indicating overflow incontinence?

In the context of overflow incontinence, a post-void residual volume of 200 mL or more is highly indicative. Overflow incontinence occurs when the bladder is unable to empty completely, leading to an accumulation of urine that exceeds normal capacity.

When post-void residual volume measurements reach 200 mL or more, it suggests that there is significant retention of urine in the bladder after attempting to void. This situation often results in involuntary leakage due to the excessive volume pressing against the bladder walls, overwhelming the bladder's ability to retain urine. This can be seen in conditions such as bladder outlet obstruction, neurogenic bladder dysfunction, or other scenarios where the bladder's normal contractility is compromised.

Understanding these thresholds is crucial in diagnosing and managing patients with urinary symptoms. Lower values, such as those below 200 mL, suggest that the bladder is able to empty more effectively, making overflow incontinence less likely. Thus, a post-void residual volume of 200 mL or more is a clear indicator of overflow incontinence.