How to Calculate the HEART Score for Chest Pain (With a Worked Example)
The HEART score stratifies a patient’s risk of a major adverse cardiac event (MACE) within six weeks of presenting with chest pain. You score five criteria, History, ECG, Age, Risk factors, and Troponin, each worth 0, 1, or 2 points, for a total between 0 and 10. A total of 0 to 3 is low risk, 4 to 6 is moderate, and 7 to 10 is high, and that tier drives whether a patient goes home, gets observed, or heads for an early invasive workup.
This guide walks through each criterion, a worked example where the score tips from moderate into high risk, and the mistakes that throw the whole calculation off.
The five criteria
| Criterion | 0 points | 1 point | 2 points |
|---|---|---|---|
| History | Slightly suspicious | Moderately suspicious | Highly suspicious |
| ECG | Normal | Non-specific repolarization disturbance | Significant ST deviation |
| Age | Under 45 | 45 to 64 | 65 or older |
| Risk factors | None known | 1 to 2 risk factors | 3 or more risk factors, or known atherosclerotic disease |
| Troponin | At or below the normal limit | 1 to 3 times the normal limit | More than 3 times the normal limit |
A few of these need unpacking:
History is a judgment call on how classic the chief complaint sounds: retrosternal pressure radiating to the arm or jaw with exertion and diaphoresis is highly suspicious, while sharp, positional, or reproducible-on-palpation pain is slightly suspicious.
Risk factors counted here are hypertension, hypercholesterolemia, diabetes, obesity (BMI over 30), current smoking or having quit within three months, a family history of cardiovascular disease, and any already-documented atherosclerotic disease (prior MI, PCI, CABG, stroke, TIA, or peripheral artery disease). A patient with known coronary disease scores 2 points here automatically, no matter how many other factors they have.
ECG changes from left bundle branch block, a paced rhythm, or digoxin effect do not score cleanly against this criterion. When the ECG can’t be read for ischemia, that judgment call falls back on the clinician rather than the checkbox.
Worked example
A 58-year-old man arrives with two hours of crushing substernal chest pain radiating to his left arm, with diaphoresis. He has hypertension, type 2 diabetes, and is a current smoker. His ECG shows nonspecific T-wave flattening, and his first troponin comes back at twice the upper limit of normal.
| Criterion | Finding | Points |
|---|---|---|
| History | Highly suspicious (classic pattern) | 2 |
| ECG | Non-specific repolarization change | 1 |
| Age | 58 (45 to 64 band) | 1 |
| Risk factors | Hypertension, diabetes, smoking (3 factors) | 2 |
| Troponin | 2x upper limit of normal | 1 |
| Total | 7 |
That total of 7 crosses out of the moderate tier (4-6) into high risk (7-10), which is the range where guidelines favor an early invasive strategy and cardiology involvement rather than a repeat-troponin-and-reassess pathway. Compare that to a 32-year-old with atypical, reproducible chest wall pain, a normal ECG, no risk factors, and a normal troponin: every criterion scores 0, for a total of 0, comfortably in the low-risk group where many EDs support early discharge without admission.
Calculate it with your own values
Risk by score
These figures come from pooled validation studies and vary a little between cohorts, so treat them as estimates rather than exact probabilities for an individual patient.
| Score | Risk tier | Approx. 6-week MACE |
|---|---|---|
| 0 to 3 | Low | 0.9% to 1.7% |
| 4 to 6 | Moderate | 12% to 16.6% |
| 7 to 10 | High | 50% to 65% |
Many EDs pair the low-risk tier with a single normal troponin (the “HEART Pathway”) to justify discharge without serial testing or stress imaging. Moderate and high scores usually mean admission, serial troponins, and in the high tier, an earlier conversation with cardiology.
Common mistakes
Undercounting risk factors when disease is already known. A patient with a prior MI or stent scores the full 2 points on the risk-factor row automatically. You don’t need to also tally their hypertension and diabetes separately, the atherosclerotic history alone maxes that row out.
Scoring the ECG row on a paced rhythm or LBBB. Neither pattern can be reliably read for the ST changes this criterion is looking for. Lean on the other four criteria and clinical judgment rather than forcing a number here.
Treating the HEART score as a replacement for ruling out STEMI. This tool is for risk-stratifying patients who are already past the initial screen for an obvious ST-elevation MI or another immediately unstable presentation. It answers “how risky is this patient over the next six weeks,” not “does this patient need the cath lab right now.”
Ignoring troponin trend. A single troponin value plugs into the score, but a rising second troponin in a borderline case should push management up a tier even if the arithmetic total says otherwise.
Frequently asked questions
What do the five letters in HEART stand for?
History, ECG, Age, Risk factors, and Troponin. Each is scored 0, 1, or 2, for a combined total from 0 to 10.
What HEART score is considered low risk?
A total of 0 to 3 is low risk, with roughly a 0.9% to 1.7% chance of a major adverse cardiac event within six weeks. Combined with a normal initial troponin, many centers use this tier to support early discharge.
Does a high HEART score mean the patient is having a heart attack right now?
Not necessarily. It means their six-week risk of a major cardiac event is high (roughly 50% to 65% in pooled data), which is why that tier typically triggers admission and an early invasive workup rather than immediate catheterization on its own.
Can the HEART score be used instead of a troponin test?
No. Troponin is one of the five inputs, so the score already depends on having a result. Many pathways add a second, serial troponin on top of the base score before finalizing a discharge decision.