Clinical decision support

Practice guidelines and risk calculators

Third-party guidelines and prediction tools relevant to IBD surgery, each independently verified against PubMed. These are external documents and tools, linked, not reproduced, and not evidence-gated by this site.

Practice guidelines

• Clinical Practice Guideline for the Surgical Management of Ulcerative Colitis ASCRS · 2026 · PMID 42165399 · Dis Colon Rectum
  When and how to operate in UC, indications in medically refractory and acute severe disease, operative choice for dysplasia/cancer, IPAA staging and reconstruction technique.
• ECCO Guidelines on Therapeutics in Ulcerative Colitis: Surgical Treatment ECCO · 2026 · PMID 42381162 · J Crohns Colitis
  European counterpart on surgery for medically refractory UC, perioperative optimisation, surgical strategy and technique, and centre-expertise requirements.
• The American Society of Colon and Rectal Surgeons Clinical Practice Guidelines for the Surgical Management of Crohn's Disease ASCRS · 2020 · PMID 32692069 · Dis Colon Rectum
  Operative indications and technique across ileocolic, small-bowel, colonic and perianal Crohn's, including anastomotic configuration and strictureplasty.
• ECCO Guidelines on Therapeutics in Crohn's Disease: Surgical Treatment ECCO · 2024 · PMID 38878002 · J Crohns Colitis
  Preoperative optimisation, management of immunosuppression before surgery, and technical guidance for common Crohn's operative scenarios.
• ACG Clinical Guideline Update: Ulcerative Colitis in Adults ACG · 2025 · PMID 40701556 · Am J Gastroenterol
  Defines the medical ceiling a surgeon is operating against, treatment targets, advanced-therapy positioning, and the medical management of acute severe UC before colectomy.
• ACG Clinical Guideline: Management of Crohn's Disease in Adults ACG · 2025 · PMID 40701562 · Am J Gastroenterol
  Medical management of luminal, stricturing and fistulising Crohn's, plus CRC surveillance in Crohn's colitis, the context for operative timing.
• AGA Clinical Practice Guideline on the Management of Pouchitis and Inflammatory Pouch Disorders AGA · 2024 · PMID 38128971 · Gastroenterology
  GRADE-based medical management of pouchitis, Crohn's-like disease of the pouch and cuffitis, what to exhaust before considering pouch revision or excision.
• ECCO Topical Review on Pouch Disorders ECCO · 2025 · PMID 40574702 · J Crohns Colitis
  Diagnosis and management of inflammatory, functional, structural and neoplastic pouch disorders, the structural/surgical complement to the AGA pouchitis guideline.
• British Society of Gastroenterology guidelines on colorectal surveillance in inflammatory bowel disease BSG · 2025 · PMID 40306978 · Gut
  Risk-stratified surveillance intervals and the endoscopic-versus-surgical management of dysplasia, including the MDT decision to proceed to colectomy.
• British Society of Gastroenterology guidelines on inflammatory bowel disease in adults: 2025 BSG · 2025 · PMID 40550582 · Gut
  Comprehensive UK reference for IBD in adults, updating the 2019 consensus; includes surgical sections and service-organisation standards.
• The American Society of Colon and Rectal Surgeons Clinical Practice Guidelines for the Management of Anorectal Abscess, Fistula-in-Ano, and Rectovaginal Fistula ASCRS · 2022 · PMID 35732009 · Dis Colon Rectum
  Explicitly covers anorectal fistula and rectovaginal fistula in the setting of Crohn's disease, drainage, seton, flap, LIFT and diversion decisions.
• The American Society of Colon and Rectal Surgeons Clinical Practice Guidelines for the Reduction of Venous Thromboembolic Disease in Colorectal Surgery ASCRS · 2023 · PMID 37318130 · Dis Colon Rectum
  VTE risk stratification and inpatient/extended prophylaxis for colorectal surgery, the highest-yield perioperative guideline for an IBD-surgical population.
• ESPEN guideline on Clinical Nutrition in inflammatory bowel disease ESPEN · 2023 · PMID 36739756 · Clin Nutr
  Malnutrition screening, preoperative nutritional optimisation and prehabilitation in IBD, 71 recommendations, developed with surgeons on the panel.

Risk calculators and prediction tools

• ACS NSQIP Surgical Risk Calculator (v4.0.4) live calculatorexternally validated30-day risk of death and ~15 postoperative complications for a specified CPT procedure · PMID 24055383 Note: It has been formally externally validated in IBD surgery and it FAILED. Lin et al. (J Crohns Colitis 2023;17(1):73-82; PMID 35973971) found c-statistics of 0.605 any complication, 0.623 serious complication, 0.590 reoperation, 0.621 readmission, 0.574 anastomotic leak, with systematic UNDERESTIMATION of risk. Discrimination is barely above chance in IBD. Do not quote its absolute percentages to an IBD patient; the authors call for recalibration or added variables. This is the only free web tool covering IBD operations, which is exactly why the failure needs to be stated on the page.
• Travis (Oxford) criteria, day 3 of acute severe ulcerative colitis live calculatorexternally validatedPredicts failure of intravenous corticosteroids at day 3 of an ASUC admission, triggering rescue therapy or colectomy discussion Note: Derived 1996 from 48 patients. Its original 85% same-admission colectomy PPV is OBSOLETE. In the biologic era, observed in-hospital colectomy among Oxford-positive patients is roughly 20–36%. It remains a valid discriminator of steroid non-response (independent predictor, and meta-analytic OR ~4.4 for colectomy), so use it to trigger a rescue-therapy decision, never to quote a colectomy probability to a patient. Derivation PMID left blank. The original 1996 Gut record was not independently verified and was not guessed.
• ASUC 1-year colectomy score (Le Baut / Saint-Antoine IBD Network) formula only, no calculatorexternally validatedRisk of colectomy within 1 year of admission for acute severe ulcerative colitis, from four variables available at admission · PMID 31927106 Note: Genuinely validated in a separate 185-patient cohort at two other French centres, but there is NO web implementation, it must be scored by hand. Both cohorts are retrospective, French, and from 2002–2017, i.e. before JAK inhibitors and S1P modulators changed rescue therapy. The extreme strata rest on very small numbers (score 4 = 100% colectomy), so the upper end is imprecise; its real strength is as a negative predictor (NPV 87–92% for score 0).
• Postdischarge VTE risk calculator for IBD surgery (Schlick et al.) formula only, no calculatorderivation cohort only30-day post-discharge venous thromboembolism risk after surgery for IBD · PMID 33077197 Note: DERIVATION ONLY, no external validation and no published web implementation. Built on ACS NSQIP colectomy/proctectomy targeted modules 2012–2018 (n=18,990) with a very rare outcome: 199 events (1.1%), so estimates are unstable in the tails. Do not use it as the sole justification for or against extended prophylaxis; pair it with the ASCRS 2023 VTE guideline, which is the graded recommendation.
• Postoperative Crohn's disease recurrence nomogram (biologic era) formula only, no calculatorexternally validated1-year endoscopic recurrence (modified Rutgeerts score ≥i2b) after ileocolonic resection for Crohn's disease Note: Externally validated in two independent international cohorts, but AUC is only 0.72, adequate for group-level stratification, weak for individual prediction. No web implementation; nomogram lives in the paper. PMID was not retrievable at time of search (published online ~March 2026), cite by DOI and re-check before publishing. Note the paper's own headline result is that biologic prophylaxis reduced recurrence (OR 0.31) irrespective of risk factors, which argues against using the score to withhold prophylaxis from low-risk patients.