HEART Score Calculator for Chest Pain Risk
The HEART score is a validated clinical tool used in emergency departments to estimate the 30-day risk of a major adverse cardiac event (MACE) in patients presenting with chest pain. It scores five components: History, ECG, Age, Risk factors, and Troponin - each rated 0 to 2 points. A total score of 0-3 is low risk, 4-6 is intermediate, and 7-10 is high risk. Select the appropriate option for each component and your total score and risk category appear instantly.
What is the HEART Score?
The HEART Score is a risk stratification tool developed to help emergency clinicians quickly estimate the likelihood that a patient presenting with chest pain will experience a major adverse cardiac event (MACE) within 30 days. MACE is defined as myocardial infarction, percutaneous coronary intervention (PCI), coronary artery bypass grafting (CABG), or cardiac death. The acronym HEART stands for the five components scored: History, ECG, Age, Risk factors, and Troponin. Each element is rated 0, 1, or 2 points, giving a maximum total of 10. The score was first described by Backus and colleagues in the Netherlands in 2010 and has since been prospectively validated in large multicenter trials across several countries.
How to score each component
History (0-2): Score 2 for highly suspicious history - classic pressure-type chest pain radiating to the arm or jaw, relieved by nitrates, brought on by exertion. Score 1 for a moderately suspicious history that has both typical and atypical features. Score 0 for a history that is only slightly suspicious, such as sharp or positional pain with a clear non-cardiac explanation. ECG (0-2): Score 2 for significant ST deviation (new horizontal or downsloping ST depression >= 1 mm, or T-wave inversions in at least 2 contiguous leads consistent with ischemia). Score 1 for non-specific repolarization disturbances including left bundle branch block, left ventricular hypertrophy pattern, digitalis effect, or early repolarization. Score 0 for a completely normal ECG. Age (0-2): Score 0 for age < 45, 1 for age 45-64, and 2 for age >= 65. Risk Factors (0-2): Known risk factors are hypertension, hypercholesterolemia, diabetes mellitus, current or recent smoking (cessation within 3 months), and obesity (BMI > 30 kg/m2). Also count family history of coronary artery disease and known atherosclerotic disease (prior MI, PCI, CABG, stroke, peripheral artery disease). Score 2 if the patient has 3 or more risk factors or any prior atherosclerotic disease; score 1 for 1-2 risk factors; score 0 for none. Troponin (0-2): Compare the measured troponin to the local laboratory upper reference limit (URL). Score 0 if at or below the URL, 1 if 1-3 times the URL, and 2 if 3 or more times the URL. Both conventional and high-sensitivity assays can be used, referenced to the appropriate URL.
Interpreting the total score
A total score of 0-3 places the patient in the low-risk group. The prospective multicenter validation by Backus (2013) found a 6-week MACE rate of 1.7% in this group. The HEART Pathway, which pairs the score with 0-hour and 3-hour high-sensitivity troponins, showed a 0.6-0.9% MACE rate in low-risk patients over 30 days, supporting early discharge as safe for most of these patients. A score of 4-6 is intermediate risk, associated with a 12-17% MACE rate; these patients generally need observation and further evaluation before a disposition decision. A score of 7-10 signals high risk, with MACE rates of 50-65% in validation cohorts; early cardiology involvement and consideration of invasive evaluation are appropriate. The HEART Score consistently outperforms TIMI and GRACE scores for early-discharge decision-making in undifferentiated chest pain.
Limitations and clinical context
The HEART Score is a decision-support tool, not a standalone discharge criterion. Clinicians should be aware of several limitations. The History component relies on physician judgment and shows moderate inter-rater variability, particularly around atypical presentations in women, elderly patients, and people with diabetes who may not have classic symptoms. The ECG component can be difficult to apply when baseline abnormalities are present (prior LBBB, pacemaker rhythm, pre-excitation). Troponin must be interpreted against the correct local upper reference limit for the assay in use. The score was validated primarily in emergency department cohorts and may perform differently in pre-hospital or inpatient settings. Patients with chronic kidney disease can have persistently elevated troponin from non-cardiac causes, which may overestimate risk. Like any risk score, the HEART Score performs at a population level and individual clinical circumstances always take precedence.
HEART Score risk categories and MACE rates
| HEART Score | Risk Category | 30-day MACE | Typical Action |
|---|---|---|---|
| 0-3 | Low | 0.9 - 1.7% | Early discharge with outpatient follow-up |
| 4-6 | Intermediate | 12 - 16.6% | Observation, serial troponins, stress test |
| 7-10 | High | 50 - 65% | Admit; cardiology; consider early invasive strategy |
MACE percentages derived from Backus (2010) and Mahler (2015) prospective validation cohorts. MACE = myocardial infarction, PCI/CABG, cardiac death within 30 days.
Frequently asked questions
What does HEART stand for?
HEART is an acronym for the five scored components: History (clinical suspicion based on the patient's symptoms), ECG (electrocardiogram findings), Age (patient age bracket), Risk factors (cardiovascular risk factors and known atherosclerotic disease), and Troponin (cardiac biomarker level relative to the local upper reference limit). Each is scored 0-2, for a maximum total of 10.
What is a low HEART Score and what does it mean clinically?
A HEART Score of 0-3 is considered low risk. Prospective validation studies report a 30-day MACE rate of roughly 0.9-1.7% in this group. Many emergency departments use a low score, combined with a non-elevated troponin at 0 and 3 hours, to support early discharge without further inpatient workup. However, discharge should only occur when consistent with local protocols and the overall clinical picture.
How is the HEART Score different from TIMI and GRACE?
The TIMI and GRACE scores were developed to risk-stratify patients already diagnosed with non-ST-elevation acute coronary syndrome (NSTEMI or unstable angina). The HEART Score was designed for undifferentiated chest pain before a diagnosis is established - it helps the clinician decide whether a patient even needs admission and further workup. Head-to-head studies consistently show HEART outperforms TIMI for early-discharge decision-making in the emergency department.
Which troponin assay should I use?
Both conventional and high-sensitivity troponin (hs-cTn) assays can be used with the HEART Score. The key is to compare the measured value against the upper reference limit (URL) for whichever assay your laboratory uses. Score 0 if the result is at or below the URL, 1 if between 1 and 3 times the URL, and 2 if 3 or more times the URL. High-sensitivity assays have a lower URL, so a result that is "normal" on a conventional assay may still be above the hs-cTn URL - always use the correct reference for your lab.
Can the HEART Score be used for patients with STEMI?
No. The HEART Score is not intended for patients with ST-elevation myocardial infarction (STEMI). STEMI is a time-critical emergency requiring immediate reperfusion therapy, and no risk-stratification score changes that management. The HEART Score is designed for patients with undifferentiated chest pain where ACS has not yet been confirmed or ruled out.
What is MACE?
MACE stands for major adverse cardiac event. In the HEART Score literature, it is typically defined as any of the following occurring within 30 days: acute myocardial infarction, percutaneous coronary intervention (PCI, stenting), coronary artery bypass grafting (CABG), or cardiac death. Some studies also include significant arrhythmia or heart failure as additional MACE endpoints.
Sources
- Backus BE et al. A prospective validation of the HEART score for chest pain patients at the emergency department. Int J Cardiol. 2013.
- Mahler SA et al. The HEART Pathway Randomized Trial: Identifying Emergency Department Patients With Acute Chest Pain for Early Discharge. Circ Cardiovasc Qual Outcomes. 2015.