[Evaluation of bladder volume by ultrasonography]

The aim was to evaluate bladder volume measurement using computerized calculation in comparison with usual formulas. Twenty-eight volunteers underwent bladder ultrasonography, which was recorded for computerized measurement of bladder volume. From diameters and/or areas measurements, bladder volume was calculated using 12 different formula. True bladder volume was obtained from voided volume measurement. Computerized measurement was not more accurate than formulas. No formulas displayed association of low percentage error and standard deviation and good accuracy. The best accuracy was obtained with the combined formula F12 ([(DSc x DAPc x DT x 0.523) + (DT x AS)]/2). Formula (F4) using the three diameters, with reference to anterior bladder recessus and 0.625 correction factor displayed good results on the average.