GRACE Calculator
Estimate risk in acute coronary syndrome using the GRACE score.
What Is the GRACE Score?
The GRACE (Global Registry of Acute Coronary Events) score is a validated risk stratification tool used in patients presenting with acute coronary syndrome (ACS). It estimates the likelihood of in-hospital or six-month mortality based on clinical and laboratory parameters collected at the time of admission.
This calculator implements the GRACE risk model to help clinicians quickly assess patient risk and guide treatment decisions, including the need for early invasive management.
How the GRACE Score Is Calculated
The GRACE score assigns points to eight key variables, each weighted according to their prognostic significance. The total score corresponds to a predicted mortality risk.
Variables Included
- Age – Higher age increases risk.
- Heart rate – Elevated heart rate at presentation is associated with worse outcomes.
- Systolic blood pressure – Lower blood pressure increases risk.
- Killip class – A measure of heart failure severity (I through IV).
- Serum creatinine – Renal impairment raises risk.
- Cardiac arrest at admission – A history of arrest significantly increases risk.
- ST-segment deviation – Presence of ST changes on ECG indicates higher risk.
- Elevated cardiac biomarkers – Positive troponin or CK-MB indicates myocardial injury.
Each variable contributes a specific number of points. The sum of all points is the total GRACE score.
Interpreting the GRACE Score
The total score is used to classify patients into three risk categories for in-hospital mortality:
| Risk Category | GRACE Score Range | Predicted In-Hospital Mortality |
|---|---|---|
| Low | ≤ 108 | < 1% |
| Intermediate | 109 – 140 | 1% – 3% |
| High | > 140 | > 3% |
For six-month mortality, different thresholds apply. The calculator provides both in-hospital and six-month risk estimates.
Practical Use Cases
- Emergency department triage – Quickly identify high-risk patients who may benefit from early revascularization.
- Treatment planning – Guide decisions on anti-thrombotic therapy and the timing of angiography.
- Prognostic communication – Provide patients and families with an evidence-based risk estimate.
- Clinical audit – Benchmark local outcomes against established risk models.
Limitations
- The GRACE score is derived from registry data and may not fully capture individual patient nuances.
- It does not account for comorbidities such as diabetes or prior revascularization, which may influence risk.
- The score is most accurate when calculated at the time of presentation; risk may change with treatment.
- It is intended as a decision-support tool, not a substitute for clinical judgment.
FAQ
What is the difference between GRACE and TIMI scores?
Both are risk scores for ACS, but GRACE is generally considered more accurate for predicting in-hospital and six-month mortality. TIMI is simpler and often used for early risk stratification in unstable angina/NSTEMI.
Can the GRACE score be used for STEMI patients?
Yes. The GRACE score was developed and validated in a broad ACS population that includes STEMI, NSTEMI, and unstable angina. It is appropriate for all ACS subtypes.
What Killip class should I use?
Killip class is based on clinical signs of heart failure at presentation: Class I (no heart failure), Class II (rales, S3 gallop), Class III (frank pulmonary edema), Class IV (cardiogenic shock). Use the class that best matches the patient's condition at the time of assessment.
Is the GRACE score still relevant with modern treatments?
Yes. The GRACE score remains widely used and is recommended by major cardiology guidelines (ESC, ACC/AHA) for risk stratification in ACS. It has been validated in contemporary cohorts.
What if creatinine is not available?
The GRACE score requires serum creatinine. If unavailable, the score cannot be calculated accurately. Consider using an alternative risk score that does not require renal function, though with reduced predictive accuracy.