Accuracy of Portable Ultrasound Measurement of the Bladder Volume Using the Manual Fanning Scan and Traditional Motorized Scan Methods.

PURPOSE: To compare the accuracy of portable ultrasound bladder scanner (PUBS) for measuring bladder volume (BV) using manual fanning scan (MFS) and traditional motorized scan (TMS) methods. METHODS: Patients with lower urinary tract symptoms who underwent a urodynamic study at the urology outpatient clinic from October to December 2024 were prospectively enrolled. BV was measured using TMS-type (TMS-BV) and MFS-type (MFS-BV) PUBS prior to free uroflowmetry. True BV (T-BV) was defined as the sum of the voided volume and the postvoid residual volume drained through the urethral catheter after voiding. TMS-BV and MFS-BV were compared and analyzed against T-BV. RESULTS: Data from 39 patients (30 males and 9 females; mean age, 65.3±14.8 years) were analyzed. TMS-BV (230.9±157.9 mL) and MFS-BV (222.6±154.2 mL) did not differ significantly from T-BV (230.6±156.6 mL) (P>0.05). Comparison of the percentage of difference in volume between TMS-BV and MFS-BV across 100-mL BV ranges revealed no significant difference (P>0.05). The mean difference between TMS-BV and T-BV (0.2±50.2) did not differ significantly from the mean difference between MFS-BV and T-BV (-8.0±69.1) (P>0.05). The correlation between TMS-BV and T-BV (R2=0.90) was stronger than that between MFS-BV and T-BV (R2=0.81). CONCLUSION: The correlation between MFS-type PUBS and T-BV was lower than that between TMS-type PUBS and T-BV. However, the measurement accuracy of BV was similar using both methods.