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Neurology · Emergency Medicine

HAT Score for Hemorrhage after Thrombolysis calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

mg/dL

Allowed range: 20–800 mg/dL

Quick picks

Table 1 gives 1 point for diabetes or glucose above 200 mg/dL. A value of exactly 200 mg/dL does not add that point.

points

Allowed range: 0–42 points

Quick picks
Easily visible hypodensity on the initial head CT

Table 1 lists none, less than one third of the MCA territory, or more than one third. Exactly one third is not its own row.

Result

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Clinical inputs

  • History of diabetes
  • Baseline blood glucose (mg/dL)Accepted range: 20 to 800
  • Pretreatment NIHSS (points)Accepted range: 0 to 42
  • Easily visible hypodensity on the initial head CT

Primary source

Lou M et al. The HAT Score: a simple grading scale for predicting hemorrhage after thrombolysis. Neurology. DOI: 10.1212/01.wnl.0000330297.58334.dd. PMID: 18955684. Table 1: diabetes or baseline glucose >200 mg/dL = 1; NIHSS <15 = 0, 15–20 = 1, >20 = 2; easily visible hypodensity none = 0, <1/3 MCA = 1, >1/3 MCA = 2. In the combined cohorts, symptomatic ICH was 2% at 0 points, 5% at 1, 10% at 2, 15% at 3, and 44% at more than 3. (2008)

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