Surgery Calculators

Predicts mortality after emergency surgery for perforated peptic ulcer. Three simple risk factors.

Intraoperative 3-variable score predicting major postoperative complications and death within 30 days.

Clinical and laboratory scoring system for acute appendicitis. Helps determine need for CT and surgical consultation.

Portsmouth-POSSUM estimates predicted morbidity and mortality for general surgical patients. Used for audit and consent.

UK-derived tool predicting 30-day postoperative mortality for in-hospital non-cardiac surgery. Validated in 22,000 patients. Endorsed by RCS England.

Internationally standardised grading system for postoperative complications from Grade I (minor deviation) to Grade V (death). Mandatory for surgical audit and research.

8-item score to predict appendicitis in children aged 3–18 years. Score ≥ 6 has sensitivity > 90% for appendicitis.

Portsmouth POSSUM (Physiological and Operative Severity Score for Enumeration of Mortality and Morbidity) predicts 30-day surgical mortality in abdominal surgery.

Estimates probability of acute appendicitis using clinical and laboratory findings. Guides CT scan and surgical referral decisions. Also known as MANTRELS score.

Stages colorectal cancer using modified Dukes and TNM classification. Guides adjuvant chemotherapy and surveillance decisions.

Stages invasive breast cancer using TNM system. Guides adjuvant therapy, sentinel node biopsy, and radiotherapy decisions.

Predicts risk of incisional hernia development after abdominal surgery. Guides prophylactic mesh placement decisions.

Stratifies differentiated thyroid cancer recurrence risk using ATA 2015 guidelines. Guides extent of surgery, radioiodine (RAI), and surveillance intensity.

National Emergency Laparotomy Audit (NELA) risk model predicts 30-day mortality for emergency laparotomy. Mandated for all emergency laparotomies in England and Wales.

Colorectal-specific recalibration of POSSUM (Tekkis 2004) predicting 30-day mortality after colorectal surgery. Sums physiology + operative severity weighted variables. Use the band closest to your calculated value.

Single 0–100 score summarising all post-operative complications by severity (Slankamenac 2013). Derived from Clavien-Dindo grades using the formula: CCI = √(Σ wᵢ × 100). This calculator records the calculated CCI band — use the live calculator at assessurgery.com for exact value.