Accuracy and precision of a new portable ultrasound scanner, the Biocon-700, in residual urine volume measurement

The aim of this study was to examine the accuracy of a new portable abdominal ultrasound (US) machine (Biocon-700, Mcube Technology, Seoul, Korea) for measuring postvoid residual (PVR) urine. One-hundred and twenty-five patients with voiding problems underwent PVR measurements, which were compared with the postvoid bladder volume measurements obtained by catheterization within 5 min in the same patients. Accuracy was assessed by comparing the two methods, and correlation coefficients were obtained. The Pearson's correlation coefficient between PVR volume as measured by US and by catheterization was 0.872 (R (2) = 0.76). The mean difference was 23.59 +/- 37.32 ml (95% confidence interval, 17.5-30.65 ml), and the absolute scan error tended to increase with a greater amount of catheterized residual urine volume (R (2) = 0.49). Accuracy of the Biocon-700 scanner is as good as catheter assessments of residual volume and is therefore a sufficient alternative to catheterization for determining residual urine volume.