STS Cardiac Surgery Risk Score Calculator

Estimate morbidity and mortality risk for CABG, valve, and combined cardiac surgery using Society of Thoracic Surgeons risk model.

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Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Estimate morbidity and mortality risk for CABG, valve, and combined cardiac surgery using Society of Thoracic Surgeons risk model

Each component has a specific meaning:

  • Society of Thoracic Surgeons risk model — The society of thoracic surgeons risk model recorded for the scenario being assessed.

Note: Interpret the sts score result against the thresholds and context described above.

How to Use

Enter the Society of Thoracic Surgeons risk model for the scenario you are assessing. Estimate morbidity and mortality risk for CABG, valve, and combined cardiac surgery using Society of Thoracic Surgeons risk model. Use the sts score result to inform your calculation.

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Frequently Asked Questions