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Gastroenterology medical calculators

All 103 Gastroenterology medical calculators on DocMath, A–Z. All specialties

2019 ACR/EULAR IgG4-related disease classification criteriaClassifies IgG4-related disease (including autoimmune pancreatitis and IgG4-related sclerosing cholangitis) for research and clinical support.
ABC score (upper and lower GI bleeding mortality)Pre-endoscopy risk of death in acute upper or lower GI bleeding from Age, Blood tests and Comorbidities.
AIMS65In-hospital mortality in upper GI bleeding.
ASGE 2019 choledocholithiasis risk (high / intermediate / low)Probability of common bile duct stones in symptomatic cholelithiasis and the recommended next test (ASGE 2019).
ATLAS score (C. difficile infection)Bedside score (0–10) at C. difficile diagnosis that predicts clinical cure with oral vancomycin or fidaxomicin.
BISAP (acute pancreatitis)Early in-hospital mortality in acute pancreatitis (first 24 h).
Bismuth–Corlette classification (perihilar cholangiocarcinoma)Anatomical extent of perihilar (Klatskin) cholangiocarcinoma along the biliary confluence and hepatic ducts (modified classification, Bismuth 1992).
Boston Bowel Preparation Scale (BBPS)Rates colon cleanliness after washing and suctioning, during withdrawal.
C. difficile infection severity (IDSA/SHEA)Classifies an initial episode of C. difficile infection as non-severe, severe or fulminant.
Cambridge classification of chronic pancreatitis (pancreatography)Grades pancreatogram changes of chronic pancreatitis as normal, equivocal, mild, moderate or marked (Cambridge 1984 workshop definitions).
CDEIS (Crohn's Disease Endoscopic Index of Severity)Endoscopic severity of Crohn's disease from ulceration, extent of disease and stenosis in five ileocolonic segments.
Celiac disease: no-biopsy diagnosis criteriaChecks eligibility for a serology-based (no-biopsy) celiac diagnosis: children per ESPGHAN 2020, adults per BSG 2026.
Chicago Classification v4.0 (esophageal HRM)Classifies a high-resolution manometry study into a CCv4.0 motility diagnosis from the swallow-level metrics of the 10 primary-position wet swallows.
CRC screening by family history (CAG 2018)Canadian Association of Gastroenterology Banff consensus: when and how to screen people with a family history of non-hereditary colorectal cancer or adenoma.
Crohn's Disease Activity Index (CDAI)Clinical activity of Crohn's disease from a 7-day symptom diary plus examination and labs.
CT severity index (Balthazar CTSI)Grades acute pancreatitis on contrast-enhanced CT from peripancreatic inflammation (Balthazar grade A–E) and extent of necrosis.
Edmonton Obesity Staging System (EOSS)Clinical and functional staging (0–4) of obesity by its medical, mental and functional impact, to guide treatment intensity alongside BMI.
EREFS (EoE endoscopic reference score)Grades the five major endoscopic features of eosinophilic esophagitis (edema, rings, exudates, furrows, stricture) as in Hirano 2013.
Forrest classification (peptic ulcer bleeding)Endoscopic stigmata of recent hemorrhage in peptic ulcer, with rebleeding risk and management.
Gastric emptying scintigraphy — retention interpretationInterprets percent gastric retention of the standard low-fat egg-white meal at 1, 2 and 4 h (ANMS/SNM 2008 consensus).
Geboes histological score (ulcerative colitis)Grades histological inflammation in ulcerative colitis biopsies from architectural change (grade 0) to erosion or ulceration (grade 5).
Glasgow-Blatchford Bleeding ScoreNeed for intervention in upper GI bleeding; identifies very-low-risk patients for outpatient care.
Glasgow-Imrie criteria (acute pancreatitis)Predicts severe acute pancreatitis using the worst values in the first 48 hours (PANCREAS).
GLIM criteria for malnutritionDiagnoses malnutrition (≥1 phenotypic + ≥1 etiologic criterion) and grades severity from weight loss and BMI in adults after a positive risk screen (GLIM 2019, as restated in the 2025 5-year update).
HAPS (Harmless Acute Pancreatitis Score)Identifies, within 30 minutes of admission, patients with a first attack of acute pancreatitis who are likely to have a non-severe course.
Harvey-Bradshaw Index (Crohn’s disease)Crohn's disease activity.
Hill grade (gastro-esophageal flap valve)Endoscopic grade I–IV of the gastro-esophageal flap valve seen on retroflexion (Hill 1996).
Ho index (acute severe UC)Risk of failing intravenous corticosteroids in acute severe ulcerative colitis, from day 1–3 data.
I-SEE (Index of Severity for Eosinophilic Esophagitis)Points-based severity of EoE from symptoms and complications, inflammatory and fibrostenotic features (AGA consensus 2022).
IBUS-SAS (intestinal ultrasound activity, Crohn's disease)International Bowel Ultrasound Segmental Activity Score (0–100) for one bowel segment in Crohn's disease.
International Consensus Diagnostic Criteria (ICDC) for autoimmune pancreatitisClassifies suspected autoimmune pancreatitis as definitive or probable type 1 or type 2 AIP, or AIP not otherwise specified (International Association of Pancreatology 2011).
IPMN high-risk stigmata and worrisome features (Kyoto 2024)Classifies a presumed IPMN (mainly branch-duct) by the Kyoto guideline high-risk stigmata and worrisome features and gives the matching next step or surveillance interval.
JNET classification (magnifying NBI, colorectal tumors)Japan NBI Expert Team classification of colorectal lesions by vessel and surface pattern on magnifying narrow-band imaging; predicts histology and depth.
Lichtiger clinical activity index (UC)Symptom and examination score (0–21) for severe ulcerative colitis; used to define response to rescue therapy.
Los Angeles classification (erosive esophagitis)Grades erosive esophagitis by the most severe mucosal break, with the Lyon 2.0 interpretation for GERD.
Lyon Consensus 2.0 (GERD diagnosis)Classifies endoscopy and reflux-monitoring findings as conclusive, borderline or against GERD, off PPI (unproven GERD) or on PPI (proven GERD), per Lyon Consensus 2.0 (2024).
M-ANNHEIM severity index (chronic pancreatitis)Clinical severity of chronic pancreatitis (A–E) from pain, surgery, exocrine and endocrine insufficiency, Cambridge morphology and severe complications.
MaRIA and simplified MaRIA (MR enterography, Crohn’s)Segmental MR activity in ileocolonic Crohn’s disease: original MaRIA (needs relative contrast enhancement) and simplified MaRIA (4 qualitative signs).
Mayo score / partial Mayo (ulcerative colitis)Ulcerative colitis activity; endoscopic subscore optional (partial Mayo without it).
Milan Ultrasound Criteria (MUC, ulcerative colitis)Intestinal ultrasound score for endoscopic activity in ulcerative colitis, from colonic wall thickness and color Doppler flow.
Modified CT severity index (Mortele)Simplified CT grading of acute pancreatitis that adds extrapancreatic complications; 0–10 points in 2-point steps.
Modified Marsh (Marsh–Oberhuber) classification — celiac histologyDuodenal histology type 0–3c (with type 4) from intraepithelial lymphocytes, crypt hyperplasia and villous atrophy.
Modified Marshall score (organ failure in pancreatitis)Scores respiratory, renal and cardiovascular failure as used in the revised Atlanta classification.
Montreal classification (Crohn’s disease and ulcerative colitis)Phenotype code for adult IBD: Crohn’s age/location/behavior (A, L, B, p) or UC extent and severity (E, S).
Nancy histological index (ulcerative colitis)Three-item histological activity index for ulcerative colitis biopsies (grade 0–4); recommended by ECCO for clinical practice.
NICE classification (NBI International Colorectal Endoscopic)Predicts colorectal polyp histology (hyperplastic, adenoma, deep submucosal invasive cancer) from color, vessels and surface pattern under narrow-band imaging, with or without magnification.
NOBLADS score (severe acute lower GI bleeding)Risk that acute lower GI bleeding in a hospitalized patient will be severe (continuous and/or recurrent), from 8 admission factors.
NRS-2002 (Nutritional Risk Screening 2002)Hospital nutritional risk screen: pre-screen, then impaired nutritional status + disease severity + age ≥70 (ESPEN 2002).
Oakland score (lower GI bleeding)Safe discharge after lower GI bleeding.
OLGA / OLGIM gastritis stagingStages gastric cancer risk (0–IV) from Sydney-protocol biopsy scores of atrophy (OLGA) or intestinal metaplasia (OLGIM) in the antrum and corpus.
Oxford (Travis) day-3 criteria, acute severe UCPredicts colectomy on the index admission after 3 days of intravenous corticosteroids for acute severe ulcerative colitis.
Paris classification (pediatric IBD)Pediatric modification of the Montreal classification: A1a/A1b, L4a/L4b, B2B3, growth (G) for Crohn’s; E4 and ever-severe (S1) for UC.
Paris classification of superficial colorectal lesionsEndoscopic morphology of superficial (type 0) colorectal neoplastic lesions, with the observed rate of submucosal invasion by type and size.
PASS (Pancreatitis Activity Scoring System)Dynamic disease-activity score in acute pancreatitis, recalculated every 12 hours; admission PASS >140 and discharge PASS >60 carry prognostic meaning.
Pediatric Ulcerative Colitis Activity Index (PUCAI)Non-invasive ulcerative colitis activity in children (0–85), with the validated remission/mild/moderate/severe bands.
Perianal Crohn’s Disease Activity Index (PDAI)Activity of perianal Crohn’s disease from five items scored 0–4 (total 0–20); PDAI >4 indicates active perianal disease.
Post-ERCP pancreatitis risk factors (ESGE 2020)Checklist of patient- and procedure-related risk factors; ESGE considers ≥1 definite or ≥2 likely factors as high risk for post-ERCP pancreatitis.
Post-polypectomy surveillance interval (USMSTF 2020)Gives the next colonoscopy interval from the baseline findings, using the shortest interval among all findings (US Multi-Society Task Force 2020).
Prague C & M criteria (Barrett’s esophagus) with surveillance intervalRecords Barrett’s segment length by the Prague C & M criteria and gives the surveillance or management step for the histology (AGA 2025, CAG-endorsed; ESGE 2023 lengths shown).
PREMM5 Lynch syndrome probabilityProbability of a germline mismatch-repair gene variant (MLH1, MSH2/EPCAM, MSH6, PMS2) from personal and family cancer history; its developers proposed germline testing at ≥2.5%.
Ranson's criteria (acute pancreatitis)Severity and mortality in acute pancreatitis (admission + 48 h).
Revised Atlanta classification (pancreatitis severity)Grades acute pancreatitis as mild, moderately severe or severe from organ-failure duration and complications.
Robarts Histopathology Index (RHI)Weighted four-item histological activity index for ulcerative colitis (0–33).
Rockall score (pre- and post-endoscopy)Rebleeding and mortality risk in upper GI bleeding.
Rome V criteria for abdominal migraine (adults)Rome V (2026) diagnostic criteria for abdominal migraine in adults, a new adult Rome V category.
Rome V criteria for cannabinoid hyperemesis syndromeRome V (2026) diagnostic criteria for cannabinoid hyperemesis syndrome (CHS).
Rome V criteria for centrally mediated abdominal pain syndromeRome V (2026) diagnostic criteria for centrally mediated abdominal pain syndrome (CAPS), category A or B.
Rome V criteria for chronic constipation (formerly functional constipation)Diagnostic criteria for chronic constipation, the Rome V name for functional constipation (2026).
Rome V criteria for chronic nausea vomiting syndromeRome V (2026) diagnostic criteria for chronic nausea vomiting syndrome (CNVS).
Rome V criteria for cyclic vomiting syndromeRome V (2026) diagnostic criteria for cyclic vomiting syndrome (CVS) in adults.
Rome V criteria for dyssynergic defecationRome V (2026) diagnostic criteria for dyssynergic defecation, graded probable (1 abnormal test) or definite (≥2).
Rome V criteria for excessive belching disordersRome V (2026) diagnostic criteria for excessive belching disorders, with the supragastric and gastric subtypes.
Rome V criteria for fecal incontinenceRome V (2026) diagnostic criteria for fecal incontinence in adults.
Rome V criteria for functional abdominal bloating/distension (adults)Rome V (2026) diagnostic criteria for functional abdominal bloating and/or visible distension.
Rome V criteria for functional anorectal painRome V (2026) diagnostic criteria for levator ani syndrome, unexplained anorectal pain and proctalgia fugax.
Rome V criteria for functional chest painRome V (2026) diagnostic criteria for functional chest pain of presumed esophageal origin.
Rome V criteria for functional diarrhea (adults)Rome V (2026) diagnostic criteria for functional diarrhea.
Rome V criteria for functional dyspepsiaDiagnostic criteria for functional dyspepsia and its subtypes, postprandial distress syndrome (PDS) and epigastric pain syndrome (EPS) (Rome V, 2026).
Rome V criteria for functional dysphagiaRome V (2026) diagnostic criteria for functional dysphagia.
Rome V criteria for functional heartburnRome V (2026) diagnostic criteria for functional heartburn, with the reflux-symptom association that separates it from reflux hypersensitivity.
Rome V criteria for globusRome V (2026) diagnostic criteria for globus.
Rome V criteria for IBS (adults)Diagnostic criteria for irritable bowel syndrome and its subtype by stool form (Rome V, 2026).
Rome V criteria for inability to belch syndromeRome V (2026) diagnostic criteria for inability to belch syndrome, a new Rome V category.
Rome V criteria for narcotic bowel syndrome (opioid-induced GI hyperalgesia)Rome V (2026) diagnostic criteria for narcotic bowel syndrome, also called opioid-induced gastrointestinal hyperalgesia.
Rome V criteria for opioid-induced constipationRome V (2026) diagnostic criteria for opioid-induced constipation.
Rome V criteria for rectal hypersensitivityRome V (2026) diagnostic criteria for rectal hypersensitivity on rectal balloon distention sensory testing.
Rome V criteria for rectal hyposensitivityRome V (2026) diagnostic criteria for rectal hyposensitivity on rectal balloon distention sensory testing.
Rome V criteria for reflux hypersensitivityRome V (2026) diagnostic criteria for reflux hypersensitivity: heartburn or chest pain triggered by physiologic reflux.
Rome V criteria for rumination syndromeRome V (2026) diagnostic criteria for rumination syndrome.
Rutgeerts score (postoperative Crohn's recurrence)Grades endoscopic recurrence in the neoterminal ileum after ileocolonic resection (first colonoscopy, ~6–12 months).
SES-CD (Simple Endoscopic Score for Crohn's Disease)Endoscopic activity of ileocolonic Crohn's disease. Score each segment; unexplored segments score 0.
Simple Clinical Colitis Activity Index (SCCAI)Symptom-based ulcerative colitis activity (no labs or endoscopy), with the published remission, relapse and improvement cut-offs.
SMSA polyp complexity levelSize, Morphology, Site and Access score grading the technical difficulty of a colonic polypectomy (levels I–IV).
Strate score (severe acute lower GI bleeding)Risk that acute lower intestinal bleeding will be severe (ongoing or recurrent), from 7 bedside factors in the first 4 hours.
SUS-CD (Simple Ultrasound Score for Crohn's Disease)Intestinal ultrasound activity score for Crohn's disease from bowel wall thickness and color Doppler in five ileocolonic segments.
Tokyo Guidelines 2018 — acute cholangitis (diagnosis & severity)TG18/TG13 diagnostic criteria (suspected / definite) and severity grade I–III for acute cholangitis.
Tokyo Guidelines 2018 — acute cholecystitis (diagnosis & severity)TG18/TG13 diagnostic criteria (suspected / definite) and severity grade I–III for acute cholecystitis.
Truelove & Witts (ulcerative colitis severity)Identifies acute severe ulcerative colitis needing admission.
UC-IUS index (intestinal ultrasound, ulcerative colitis)Point-based intestinal ultrasound activity index (0–7) for one colonic segment in ulcerative colitis (rectum excluded).
UCEIS (Ulcerative Colitis Endoscopic Index of Severity)Endoscopic severity of ulcerative colitis. Score the most severe area seen.
WSES classification of acute left colonic diverticulitis (with modified Hinchey)CT-based WSES stage of acute left colonic diverticulitis with the WSES 2020 management step; optional modified Hinchey stage for comparison.
Zar severity score (C. difficile infection)Bedside severity stratification of C. difficile-associated diarrhea (mild vs severe) used in the Zar vancomycin vs metronidazole trial.
Zargar endoscopic grading of caustic injuryEndoscopic grade (0–3b) of esophageal/gastric injury after caustic ingestion, predicting early complications, death and stricture.