Figure 6. The height of the bladder (h) can be found by measuring the longest sagittal (longitudinal) plane of the bladder. By turning the transducer into a transverse view, the physician can measure the maximal length (l). In the same plane, measure the maximum width (w). The majority of ultrasound machines will automatically calculate the bladder volume when these three measurements are saved. This image also shows an incidentally found bladder mass (arrow).