ABC/2 Formula for Intracerebral Hemorrhage Volume

Estimates intracerebral hemorrhage volume from CT dimensions using bedside ellipsoid-based volumetry.

Hemorrhage shape*

Round or ellipsoidA

Irregular, separated, or multinodularB

Hemorrhage length*Greatest hemorrhage diameter (A).

Hemorrhage width*Diameter perpendicular to length (B).

Number of CT slices*Use the weighted slice count: slices with ≥75% hemorrhage area count as 1, slices with 25–75% count as 0.5, and slices with <25% count as 0.

slices

CT slice thickness*Slice thickness (C component is weighted slice count × slice thickness).