🧠 HAT Score (Post-tPA Hemorrhage)
UseWhen to use: before/around IV thrombolysis for ischemic stroke when discussing sICH risk.
StrataHigher HAT → higher sICH rates in derivation. Complements SEDAN; does not alone exclude eligible thrombolysis.
LimitsWhen not to use: as sole absolute contraindication vs guideline eligi… · Pitfall: scoring after lytics already given without documenting prete… · Endovascular candidates need separate pathways.
SourceLou M, et al. Neurology 2008 (HAT)
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
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Methodology · worked example, guidelines & full notes
0–5 points.
When to use
When to use: before/around IV thrombolysis for ischemic stroke when discussing sICH risk.
How it works
DM or glucose ≥200 mg/dL (1) + NIHSS (<15=0, 15–20=1, >20=2) + early CT hypodensity (none=0, <1/3 MCA=1, ≥1/3 MCA=2). 0–5.
Key points
- 0–5 points.
- Pairs with SEDAN.
- Next: local stroke protocol / ASPECTS.
References
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.
| History of diabetes OR admission glucose ≥ 200 mg/dL (11.1 mmol/L) | No (0) |
|---|---|
| Pretreatment NIHSS | 15–20 (1) |
| Early CT hypodensity | < 1/3 MCA territory (1) |
→HAT2/5
- Band：Intermediate (~10%)
- Use：Risk discussion around IV thrombolysis
| History of diabetes OR admission glucose ≥ 200 mg/dL (11.1 mmol/L) | No (0) |
|---|---|
| Pretreatment NIHSS | < 15 (0) |
| Early CT hypodensity | None (0) |
→HAT0/5
- Band：Lowest sICH band in derivation (~2%)
- Use：Risk discussion around IV thrombolysis
Verification & sources · governance
FAQ
Frequently asked questions
- Does HAT Score (Post-tPA Hemorrhage) upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is HAT Score (Post-tPA Hemorrhage) calculated in practice? Can you show a worked example?
- Inputs: History of diabetes OR admission glucose ≥ 200 mg/dL (11.1 mmol/L) No (0), Pretreatment NIHSS 15–20 (1), Early CT hypodensity < 1/3 MCA territory (1) → Result: HAT 2 /5（Band: Intermediate (~10%), Use: Risk discussion around IV thrombolysis） Inputs: History of diabetes OR admission glucose ≥ 200 mg/dL (11.1 mmol/L) No (0), Pretreatment NIHSS < 15 (0), Early CT hypodensity None (0) → Result: HAT 0 /5（Band: Lowest sICH band in derivation (~2%), Use: Risk discussion around IV thrombolysis）