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ABC/2 formula for intracerebral haemorrhage volume
Estimates haematoma volume from CT dimensions.
ABC/2 formula for intracerebral haemorrhage volume
A - greatest diameter on the largest slice
cm
B - diameter perpendicular to A on the same slice
cm
C - approximate vertical extent (number of slices x slice thickness)
cm
Complete the fields above to see the result.
When to use
- Bedside estimation of spontaneous intracerebral haemorrhage volume from a non-contrast CT.
Formula
Volume (mL) = (A x B x C) / 2, with A, B and C measured in centimetres.
Pearls and pitfalls
- Assumes a roughly ellipsoid clot; accuracy falls for irregular or lobulated haematomas.
- C can be taken as the number of slices containing blood multiplied by slice thickness.