2019 Volume 6 Issue 1 Pages 22-32
The aim of this study was to evaluate the validity of two methods of bladder volume estimation with respect to the voided volume and a small voided volume using hand-held ultrasound（HHU）devices. HHU devices were used in a random sequence prior to urination, followed by the estimation of voided volume. Estimated volume was then calculated using either diameter method or area method. Three devices（HHU-A, HHU-B, and HHU-C）used manual measurements of three bladder diameters（diameter method）. Two devices（HHU-D and HHU-E）used automatic measurements of bladder area（area method）. Regression coefficient was calculated using voided volume as the true value. In total, 36 data-points were obtained and the regression coefficient was closest to one in the order of HHU-A（β=0.95）, HHU-B（β=0.87）, HHU-D（β=1.17）, HHU-C（β=1.20）, and HHU-E（β=0.67）. In total, 23 data-points of less than 150 ml were obtained and the regression coefficient was closest to one in HHU-A（β=0.95）, HHU-B（β=0.87）, HHU-D（β=1.17）, HHU-C（β=1.20）, and HHU-E（β=0.67）. HHU devices using the manual diameter method had higher validity than those using the area method.
