ICH Volume ABC/2 Calculator

Calculate intracerebral hemorrhage (ICH) volume from CT scan measurements using the validated ABC/2 formula, with clinical severity interpretation.

CT Measurements

Enter all values in centimeters (cm). Slice thickness is typically 0.5 cm (5 mm) or 1.0 cm (10 mm).

Measured on the CT slice where the hemorrhage appears largest.

Diameter at 90° to A on the same slice.

C = slices × thickness — cm

Clinical Reference Thresholds

Volume Severity Note
< 10 mL Small Lower mortality risk; medical management often sufficient
10 – 30 mL Moderate Increased morbidity; close monitoring required
30 – 60 mL Large High mortality; surgical evaluation recommended
> 60 mL Critical >90% 30-day mortality in supratentorial ICH

For clinical decision support only. Always consult a physician.

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Summary

Calculate intracerebral hemorrhage (ICH) volume from CT scan measurements using the validated ABC/2 formula, with clinical severity interpretation.

How it works

  1. Identify the CT slice where the hemorrhage appears largest.
  2. Measure A — the longest diameter of the hemorrhage on that slice (in cm).
  3. Measure B — the diameter perpendicular to A on the same slice (in cm).
  4. Count the number of CT slices on which hemorrhage is visible; multiply by the slice thickness to get C (in cm).
  5. The calculator applies the formula: Volume = (A × B × C) / 2, giving result in milliliters (mL).
  6. The result is compared against established ICH severity thresholds to provide a clinical interpretation.

Use cases

  • Rapid bedside estimation of ICH volume during acute stroke assessment.
  • Guiding triage and surgical intervention decisions in neurosurgery.
  • Estimating prognosis using validated ICH scoring systems (ICH Score, FUNC Score).
  • Monitoring hematoma growth on serial CT scans.
  • Teaching medical students and residents the ABC/2 method.
  • Research and audit of ICH patient cohorts.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu