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

INTRODUCTION AND HYPOTHESIS: 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.

METHOD: 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.

RESULT: 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).

CONCLUSIONS: 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.