Surgery & Perioperative Clinical Calculators
Evidence-based surgery and perioperative calculators for pre-operative physical status (ASA PS), surgical wound classification, obstructive sleep apnea screening (STOP-BANG), venous thromboembolism risk (Caprini), and cardiac risk assessment (RCRI).
Why This Matters
Proper pre-operative risk assessment reduces perioperative complications and mortality. ASA PS is used in over 1 billion surgeries worldwide. Surgical site infections affect 2-5% of all surgeries. OSA is undiagnosed in 80% of surgical patients. VTE is a leading cause of preventable hospital death. Perioperative cardiac complications affect 1-5% of non-cardiac surgeries and are a leading cause of post-operative mortality.
When to Use
Use ASA PS for every surgical patient to document pre-operative physical status. Use Wound Classification for every operative procedure to stratify SSI risk. Use STOP-BANG for pre-operative OSA screening in all patients. Use Caprini Score for VTE risk stratification in surgical and hospitalized patients. Use RCRI for cardiac risk assessment before non-cardiac surgery.
Available Surgery & Perioperative Medicine Calculators
ASA PS
The ASA Physical Status Classification System is a simple yet powerful tool for assessing a patient's pre-operative physical status. It uses six categories (I-VI) to stratify perioperative risk and is used universally by anesthesiologists.
Calculate →Wound Class
The CDC surgical wound classification categorizes operative wounds into four classes (I-IV) based on the degree of contamination. This classification predicts surgical site infection risk and guides antibiotic prophylaxis decisions.
Calculate →STOP-BANG
The STOP-BANG questionnaire is a validated screening tool for obstructive sleep apnea (OSA). It consists of 8 yes/no questions covering Snoring, Tiredness, Observed apnea, Pressure (hypertension), BMI >35, Age >50, Neck circumference >40cm, and Gender male.
Calculate →Caprini Score
The Caprini VTE risk score is a comprehensive risk assessment tool for venous thromboembolism (VTE) in surgical patients. It assigns weighted points to 35+ risk factors across multiple domains, guiding VTE prophylaxis decisions.
Calculate →RCRI
The Revised Cardiac Risk Index (RCRI), also known as the Lee Index, is a validated tool for predicting major adverse cardiac events (MACE) in patients undergoing non-cardiac surgery. It assesses six independent predictors.
Calculate →Surgical Apgar
The Surgical Apgar Score is a simple, objective risk stratification tool that predicts major postoperative complications and 30-day mortality within minutes of surgery completion. It uses three intraoperative variables: estimated blood loss, lowest mean arterial pressure, and lowest heart rate.
Calculate →Clavien-Dindo
The Clavien-Dindo Classification is the most widely adopted system for grading the severity of surgical complications. It provides a standardized, reproducible 7-tier grading system from Grade I (minor deviation from normal recovery) to Grade V (death), based on the therapy required to correct the complication.
Calculate →Braden Scale
The Braden Scale is a widely validated tool for predicting pressure ulcer risk, assessing six subscales: sensory perception, moisture, activity, mobility, nutrition, and friction/shear. Lower scores indicate higher risk.
Calculate →LRINEC
The Laboratory Risk Indicator for Necrotizing Fasciitis (LRINEC) score is a clinically validated scoring system used to distinguish necrotizing fasciitis from other severe soft tissue infections. It uses six routine laboratory parameters to stratify patients into low, moderate, or high risk for necrotizing fasciitis, aiding in early surgical decision-making.
Calculate →Rev. Baux Score
The Revised Baux Score is a validated prognostic tool for predicting mortality in burn patients. It combines age, total body surface area (TBSA) of burns, and the presence of inhalation injury to estimate mortality risk. Originally described by Baux in 1961 and revised by Osler et al. in 2010, this score remains one of the most widely used burn prognosis tools.
Calculate →
Clinical Guidelines
- ASA Physical Status Classification — American Society of Anesthesiologists (2024)
- CDC/NHSN Surgical Site Infection Guidelines (2024)
- CHEST Guidelines for VTE Prophylaxis in Surgical Patients (2024)
- ESC/ESA Guidelines on Cardiovascular Assessment before Non-cardiac Surgery (2022)
- AHA/ACC Guideline for Perioperative Cardiovascular Evaluation (2014)
Frequently Asked Questions
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