🧠 ABC/2 Intracerebral Hemorrhage Volume
The ABC/2 method gives a bedside estimate of intracerebral hemorrhage volume from three orthogonal CT diameters.
A hematoma >30 mL—especially supratentorial—is associated with poor outcome and high mortality and is a component of the ICH score (original synthesis · not guideline verbatim).
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When to use
Measure the longest diameter on the largest slice (A), the perpendicular diameter (B), and the vertical extent (C); the tool returns the ellipsoid volume.
How it works
Volume (mL) = (A × B × C) / 2, with all diameters in centimeters; C = number of slices with hemorrhage × slice thickness.
Key points
- A hematoma >30 mL—especially supratentorial—is associated with poor outcome and high mortality and is a component of the ICH score (original synthesis · not guideline verbatim).
- ABC/2 assumes a near-ellipsoid shape and overestimates irregular or lobulated clots; use volumetric software when accuracy matters.
- Serial scans tracking volume growth (>33% or >6 mL) identify early deterioration.
References
- Kothari RU, et al. The ABCs of measuring intracerebral hemorrhage volumes. Stroke. 1996.
- Hemphill JC, et al. The ICH score: a simple, reliable grading scale for intracerebral hemorrhage. Stroke. 2001.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| A: longest diameter on the largest slice | 4 cm |
|---|---|
| B: largest diameter perpendicular to A | 3 cm |
| C: vertical extent (slices × slice thickness) | 2.5 cm |
→Estimated hematoma volume15mL
- Formula：(A×B×C)/2
Frequently asked questions
- What is ABC/2 Intracerebral Hemorrhage Volume?
- The ABC/2 method gives a bedside estimate of intracerebral hemorrhage volume from three orthogonal CT diameters.
- How is ABC/2 Intracerebral Hemorrhage Volume calculated? What is the core formula?
- Volume (mL) = (A × B × C) / 2, with all diameters in centimeters; C = number of slices with hemorrhage × slice thickness.
- When is ABC/2 Intracerebral Hemorrhage Volume used?
- Measure the longest diameter on the largest slice (A), the perpendicular diameter (B), and the vertical extent (C); the tool returns the ellipsoid volume.
- What are the key clinical points for ABC/2 Intracerebral Hemorrhage Volume?
- A hematoma >30 mL—especially supratentorial—is associated with poor outcome and high mortality and is a component of the ICH score (original synthesis · not guideline verbatim). ABC/2 assumes a near-ellipsoid shape and overestimates irregular or lobulated clots; use volumetric software when accuracy matters. Serial scans tracking volume growth (>33% or >6 mL) identify early deterioration.
- What are the limits and cautions when using ABC/2 Intracerebral Hemorrhage Volume?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is ABC/2 Intracerebral Hemorrhage Volume calculated in practice? Can you show a worked example?
- Inputs: A: longest diameter on the largest slice 4 cm, B: largest diameter perpendicular to A 3 cm, C: vertical extent (slices × slice thickness) 2.5 cm → Result: Estimated hematoma volume 15 mL（Formula: (A×B×C)/2）