Post-Void Residual Urine Volume and Prostate Size Guidelines

Post-Void Residual Urine Volume

A post-void residual (PVR) urine volume greater than 200-300 mL is considered clinically significant, while a prostate volume greater than 30 mL is generally considered enlarged 1, 2, 3
PVR volumes between 200-300 mL may indicate significant bladder dysfunction and predict a less favorable response to treatment 1
PVR of 350 mL or greater strongly indicates bladder dysfunction and may herald disease progression, particularly in BPH 3, 1
No specific PVR "cut-point" has been established for clinical decision-making due to test-retest variability, but values above 200-300 mL warrant attention 1, 2
Due to marked intra-individual variability, PVR measurement should be repeated to improve precision 4, 1
Transabdominal ultrasonography is the preferred non-invasive method for determining PVR 4
PVR between 0-300 mL does not predict response to medical therapy for BPH 3
No level of residual urine, in and of itself, mandates invasive therapy for BPH, but should be considered in the context of other clinical factors 3

Prostate size assessment is important when considering certain treatments (e.g., hormonal therapy, thermotherapy, stents, transurethral incision of the prostate) 4
Transabdominal or transrectal ultrasound are the preferred methods for assessing prostate size, shape, and configuration 4
Transrectal ultrasonography is the method of choice when elevated PSA is present to evaluate the prostate and guide biopsies if needed 4
Larger glands may require different treatment approaches than smaller glands in men with similar symptoms 4

PVR measurement is considered an optional test in the initial evaluation of men with lower urinary tract symptoms (LUTS) but becomes more important in those considering invasive therapy 2, 3
Men with maximum flow rate (Qmax) less than 10 mL/sec are more likely to have urodynamic obstruction and may benefit more from surgical intervention 3