In order to predict the size of the graft obtained with the split liver procedure, we adopted a formula for calculating the standard liver volume (SLV) in the pediatric and adult population, proposed by Urata and colleagues &.
The formula calculate the standard liver volume on the basis of the body surface area (BSA), derived from individual body weight (BW) and body height (BH).
For individuals less than 15 year-old, the body surface area is calculated as follows:
BSA (m2) = BW (kg) 0.378xBH (cm) 0.3964x0.024265
For individuals 15 year-old or more, the body surface area is calculated as follows:
 BSA (m2) = BW (kg) 0.425xBH (cm) 0.725x0.007184
Standard liver volume is derived from body surface area with the following formula:
SLV (ml) = 706.2 xBSA + 2.4
From the standard liver volume we extrapolate the volume of the split graft assuming that the left lateral segment represents about 25-30% of the total liver volume, and that the left hemiliver is about 40% of the total liver volume &.