urinary bladder volume in mL =
= (width in cm) * (depth in cm) * (length in cm) / 2
where:
• The width is measured in the transverse view.
• The length and depth are measured in the longitudinal view along the sagittal midline (see Figure, page 23, Richter et al).
• The depth is the length along the dome of the bladder.
• The length is the maximal length in the sagittal midline
post-voiding volume as percent of pre-voiding volume =
= residual urine in percent =
= (urinary bladder volume in mL after voiding) / (urinary bladder volume in mL before voiding) * 100%
where:
• The equation on page 27 of Richter et al have the two volumes reversed, with pre-voiding as the numerator and post-voiding as the denominator)
