SUFU 2018: Accuracy of Three Non-Invasive Methods for Bladder Void Volume Analysis in Healthy Volunteers

Austin, TX ( This study aimed to compare the accuracy of bladder volumes using different non-invasive methods for bladder volume assessment including 3D ultrasound, ultrasound-based bladder scan, and Uroflow meters. 

Participants determined to have low urgency through ICIq-OAB were recruited for the prospective study. Each participant consumed two liters of G2 Low Calorie Gatorade in order to fill their bladders. Once bladder capacity was reached, participants were asked to void into a Uroflow machine, which measured voided volume. Three Bladder Scans were recorded pre- and post-void and averaged to determine voided volume (pre-void volume minus post-void volume). Conventional transabdominal Ultrasound 3D images were taken pre- and post-void, and then traced in six planes using GE’s 4D View software to determine bladder volume and calculate voided volume. Ultrasound, Bladder Scan, Uroflow, and observed volumes were obtained and analyzed. The voided volume measurements were compared to the observed volume (control) collected in a 1000 mL beaker.

The results that presented showed the participants had mean age of 23±0.7 years, BMI 24±1.3 kg/m2, and bladder volume 559±34 ml. The Uroflow was the most accurate method in determining the voided volume of the bladder with an RMS error of 7% while the Bladder Scan and ultrasound yielded percent errors of 13% and 24%, respectively when compared to the control.

In conclusion the Uroflow volumes exhibited the lowest error when compared to the observed voided volume followed by the Bladder Scan. 3D ultrasound tended to underestimate bladder volume in this group of healthy individuals, likely because the bladders at full capacity were usually too large (>500 ml) to fully visualize

Presenter by: Naomi Vinod

Authors: Naomi Vinod ¹, Anna S. Nagle PhD², Hameeda A. Naimi BS³, Derek Sheen BS³, Hiren Kolli BS³, Uzoma A. Anele MD³, Adam P. Klausner MD³,⁴ and John E. Speich PhD²

Author Information:
1. Department of Surgery/Division of Urology, Richmond, VA
2. Department of Mechanical & Nuclear Engineering, Virginia Commonwealth University School of Engineering, Richmond, VA;
3. Department of Surgery/Division of Urology, Virginia Commonwealth University School of Medicine, Richmond, VA
4. Department of Surgery Hunter Holmes McGuire Veterans Affairs Medical Center, Richmond, VA

Written by: Bilal Farhan, MD, Female Urology Fellow and Voiding Dysfunction, Department of Urology, University of California, Irvine at the Society of Urodynamics, Female Pelvic Medicine & Urogenital Reconstruction Winter Meeting (SUFU 2018), February 27-March 3, 2018, Austin, Texas