Post-Void Residual Volume Assessment
A post-void residual (PVR) volume of 17 mL is not a concern for urinary health, as it falls well within normal parameters. 1
Normal PVR Values and Clinical Significance
- According to the American Urological Association guidelines, normal PVR should be less than 50 mL in healthy individuals 1
- A PVR of 17 mL indicates excellent bladder emptying function
- PVR measurements show significant intra-individual variability, requiring repeated measurements for clinical relevance 1
Clinical Context of PVR Measurement
When PVR Becomes Concerning:
- PVR volumes of 100-200 mL are considered a threshold requiring caution before certain treatments like botulinum toxin therapy 1
- PVR volumes >350 mL may indicate bladder dysfunction and predict less favorable response to treatment 1
- A PVR volume of 180 mL or greater has been associated with increased risk of bacteriuria in adult men 2
Factors Affecting PVR Measurement Accuracy:
- Pre-void bladder volume significantly impacts PVR measurement accuracy 3
- Uncomfortably full bladders (>540 mL) can result in falsely elevated PVR readings even in healthy individuals 3
- Some experts recommend using residual fraction (RF = PVR × 100/pre-void volume) instead of absolute PVR volume for more accurate assessment 4
Clinical Implications of Normal PVR
- A PVR of 17 mL indicates:
- Effective bladder emptying
- No evidence of detrusor underactivity
- No evidence of bladder outlet obstruction
- Low risk for urinary tract infections
When to Consider Further Evaluation
PVR monitoring would only be necessary if:
- The patient develops lower urinary tract symptoms
- There are neurological conditions affecting bladder function
- The patient has recurrent urinary tract infections
- There is a significant change in voiding patterns
Conclusion
The PVR of 17 mL is well below all clinical thresholds for concern (normal being <50 mL) 1. This value indicates excellent bladder emptying and requires no further intervention or monitoring unless other urinary symptoms develop.