TIMI Risk Score STEMI Calculator

TIMI Risk Score STEMI Calculator for Cardiology. The output reports the 0-14 score without presenting old cohort mortality as a current individual forecast. STEMI treatment must not wait for scoring.

For shared guidance on choosing a tool and documenting results, read the clinical calculator workflow.

How this calculator works

Age 65 to below 75 contributes 2 and age at least 75 contributes 3, never both. Add 1 for diabetes/hypertension/angina history, 3 for systolic BP below 100, 2 for heart rate above 100, 2 for Killip II-IV, 1 for weight below 67 kg, 1 for anterior ST elevation/LBBB and 1 for treatment delay above 4 hours.

When to use this calculator

Historical STEMI presentation risk scoring, distinct from the UA/NSTEMI TIMI instrument.

Inputs used

  • Age (years)
  • History of diabetes, hypertension or angina (one point total)
  • Systolic pressure (mmHg)
  • Heart rate (/min)
  • Clinically assessed Killip class II, III or IV
  • Weight used in equation (kg; US lb)
  • Anterior ST elevation or left bundle branch block
  • Symptom onset to treatment (hours)

Clinical interpretation

The output reports the 0-14 score without presenting old cohort mortality as a current individual forecast. STEMI treatment must not wait for scoring.

Worked example

At age 80 with all remaining factors present, the maximum is 3+1+3+2+2+1+1+1 = 14. Age 74.9 contributes 2 rather than being omitted or counted twice.

Limitations and safety notes

The original model arose in a fibrinolysis-era cohort. Contemporary PCI populations and non-STEMI presentations are not automatically interchangeable, and Killip/ECG assessment is external clinical work.

Frequently asked questions

Why can the age categories not be selected together?

They represent alternative age bands. Counting both raises the maximum to an invalid 16 rather than the correct 14.

What does this result leave unresolved?

The original model arose in a fibrinolysis-era cohort. Contemporary PCI populations and non-STEMI presentations are not automatically interchangeable, and Killip/ECG assessment is external clinical work.

References

  • https://timi.org/timi-risk-score-calculator-for-stemi/
  • https://pubmed.ncbi.nlm.nih.gov/11044416/

Editorial review and citation methodology

Maintained by the Quick Medical Calculator Editorial Team. Content record date: September 9, 2026. A content date is not evidence of independent clinical review. Individual clinical sign-off is not recorded on this page.

  • Prefer original validation studies for scoring systems and prediction tools.
  • Use current specialty society guidance, transplant allocation policy, public health guidance, or regulator resources when they govern clinical use.
  • Include limitations and safety notes when a calculator is population-specific, context-dependent, or unsuitable as a standalone decision tool.

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