Liver & Gastrointestinal
Every liver & gastrointestinal calculator on CalcEngines — unit converters, derived indices and interpretive tools, each with its formula, a worked example and the reference intervals it is judged against.
49 calculators in this section
- ABIC Score CalculatorAge, Bilirubin, INR and Creatinine — a linear score that splits alcohol-related hepatitis into three risk classes at 6.71 and 9.00, with 90-day survival for each. Not a steroid-response score.
- AIMS65 Score CalculatorFive equally weighted items — albumin, INR, mental status, systolic pressure and age — scored for in-hospital mortality in upper gastrointestinal bleeding. The albumin threshold is 3.0 g/dL, not 3.0 mg/dL.
- ALBI Grade Calculator (Albumin-Bilirubin)Grade liver function from albumin and bilirubin alone — an objective alternative to Child-Pugh with no subjective components.
- Alcohol Dehydrogenase Unit ConverterThis is the enzyme, not the alcohol. If you are looking for a blood alcohol level, you want the blood alcohol converter or the Widmark blood alcohol calculator — this page converts the catalytic activity of alcohol dehydrogenase between U/L, IU/L, µkat/L and nkat/L, which is a liver enzyme measurement ordered for entirely different reasons.
- Alkaline Phosphatase (ALP) Unit ConverterConvert alkaline phosphatase between U/L, IU/L, µkat/L and nkat/L, with adult ranges and the bone-versus-liver question.
- ALT (SGPT) Unit ConverterConvert alanine aminotransferase between U/L, IU/L, µkat/L and nkat/L, with the updated sex-specific upper limits.
- Ammonia (NH₃) Unit ConverterConvert plasma ammonia between µg/dL, µmol/L and µg/L, with the sampling rules that determine whether the result means anything.
- APRI Calculator (AST to Platelet Ratio Index)Estimate liver fibrosis from AST and platelet count alone — the simplest of the non-invasive fibrosis indices.
- AST (SGOT) Unit ConverterConvert aspartate aminotransferase between U/L, IU/L, µkat/L and nkat/L, and see why a raised AST is not always hepatic.
- AST/ALT Ratio (De Ritis Ratio) CalculatorCalculate the De Ritis ratio and read what its value suggests about the cause and stage of liver injury.
- BARD Score CalculatorA three-item score that rules out advanced fibrosis in fatty liver disease from BMI, the AST/ALT ratio and diabetes status.
- Bilirubin (Total) Unit ConverterConvert total bilirubin between mg/dL, µmol/L, mg/L and µg/dL, with adult reference ranges and jaundice thresholds.
- BISAP Score CalculatorScore the Bedside Index for Severity in Acute Pancreatitis within the first 24 hours, with Wu's published in-hospital mortality beside the total.
- Child-Pugh Score CalculatorGrade the severity of chronic liver disease from bilirubin, albumin, INR, ascites and encephalopathy, and read off the Child-Pugh class with its survival estimates.
- Crohn’s Disease Activity Index CalculatorEight weighted terms, three of them seven-day diary sums. Bring the summed counts: the published multipliers apply to the seven-day total, and applying them to a single day under-reports by sevenfold.
- Direct (Conjugated) Bilirubin Unit ConverterConvert direct bilirubin between mg/dL, µmol/L, mg/L and µg/dL, and see whether the fraction points to a cholestatic cause.
- Faecal Calprotectin InterpreterRead a faecal calprotectin against the threshold that matches the question being asked, and against the drugs and conditions that raise it.
- Fatty Liver Index (FLI) CalculatorEstimate the probability of hepatic steatosis from BMI, waist circumference, triglycerides and GGT — no imaging required.
- FIB-4 Index CalculatorEstimate the likelihood of advanced liver fibrosis from age, AST, ALT and platelet count — the first-line non-invasive test in fatty liver disease.
- Gamma-Glutamyl Transferase (GGT) Unit ConverterConvert gamma-glutamyl transferase between U/L, IU/L, µkat/L and nkat/L, with sex-specific ranges and what an isolated rise means.
- Glasgow Alcoholic Hepatitis Score CalculatorScore the GAHS from five variables, with Forrest's day-28 and day-84 survival beside the total and the 9-point threshold declared inclusive.
- Glasgow-Blatchford Score CalculatorScore upper gastrointestinal bleeding before endoscopy from eight bedside and laboratory items. A score of 0 or 1 is the very-low-risk group; the haemoglobin bands differ between men and women.
- Glasgow-Imrie Score CalculatorScore the eight modified Glasgow (PANCREAS) criteria at 48 hours, with the original nine-factor total shown alongside.
- Glutamate Dehydrogenase (GLDH) Unit ConverterConvert glutamate dehydrogenase between U/L, IU/L, µkat/L and nkat/L, with the sex-specific reference limits German laboratories publish. GLDH is a mitochondrial hepatocyte enzyme, and its interest is that it stays put when ALT rises from muscle.
- Harvey–Bradshaw Index CalculatorFive items scored on yesterday alone — the simplified CDAI. It correlates with the CDAI at r = 0.93, and regression puts one HBI point at about 27 CDAI points, which is how to read a trial endpoint against a clinic score.
- Hepatic Steatosis Index (HSI) CalculatorEstimate hepatic steatosis from the ALT/AST ratio, BMI, sex and diabetes status — no waist measurement needed.
- Indirect (Unconjugated) Bilirubin CalculatorCalculate indirect bilirubin from total and direct, and see the conjugated fraction that determines the differential.
- King’s College Criteria CalculatorApply O'Grady's transplant-referral criteria in acute liver failure, on the correct arm for the aetiology, with Bernal's lactate addition.
- Lille Model CalculatorDecide at day 7 whether corticosteroids are working in severe alcohol-related hepatitis, using the change in bilirubin.
- Lipase or Amylase: Is It Acute Pancreatitis? (Atlanta 3× ULN)Check a lipase or amylase result against the revised Atlanta classification of acute pancreatitis, which needs two of three: typical pain, the enzyme at least three times the upper limit of normal, and characteristic imaging. Enter the result and your laboratory's upper limit; the page gives the multiple, how many criteria are met, whether imaging is needed, why lipase is preferred, and which other conditions raise the enzymes. It says plainly that the level does not grade severity.
- Maddrey Discriminant Function CalculatorIdentify severe alcohol-related hepatitis, where a discriminant function of 32 or more is the conventional threshold for corticosteroids.
- Mayo Endoscopic Subscore InterpreterThe one Mayo item that carries the mucosal-healing endpoint — and the one observers agree about least. Friability sits at grade 1 in the original wording and grade 2 in the modern one, which flips the verdict.
- Mayo Score Calculator for Ulcerative ColitisThe full four-item Mayo score, endoscopy included, 0 to 12. It is not interchangeable with the partial score, and the trial definition of remission is a total of 2 or less WITH no individual subscore above 1.
- MELD 3.0 Score CalculatorCalculate the MELD 3.0 score used for liver transplant allocation, including the sex and albumin terms added in the 2023 revision.
- MELD Score Calculator (Original Model)The original MELD — creatinine, bilirubin and INR, with the lower bound of 1.0, the creatinine cap at 4.0 mg/dL and the dialysis rule that make it agree with a transplant centre's number.
- MELD-Na Score CalculatorCalculate the sodium-adjusted MELD score used for liver allocation from 2016 until MELD 3.0 replaced it.
- MELD-XI Score CalculatorMELD excluding INR — the two-variable version for patients whose INR is set by warfarin rather than by their liver. Bilirubin and creatinine only, and the bounding is an open question this page states plainly.
- NAFLD Fibrosis Score CalculatorEstimate advanced fibrosis in fatty liver disease from age, BMI, glycaemic status, AST/ALT ratio, platelets and albumin.
- Oxford Day-3 Criteria Interpreter for Severe ColitisTwo numbers on the third day of intravenous corticosteroid — the stool count and the CRP — that identified a group of whom 85% came to colectomy in the 51 Oxford episodes they were derived in.
- Partial Mayo Score CalculatorThe three non-endoscopic Mayo items, 0 to 9, for the visits where no endoscopy is done. It is a strict subset of the full score, not a substitute for it, and three different remission thresholds are in print.
- PELD Score CalculatorThe Paediatric End-Stage Liver Disease score for candidates under 12 — bilirubin, INR, albumin, age under one year and growth failure. Not MELD with smaller numbers: a different model with a different albumin term.
- R-Factor Calculator (Liver Injury Pattern)Classify liver injury as hepatocellular, cholestatic or mixed from ALT and ALP relative to their upper limits of normal.
- Raised Alkaline Phosphatase (ALP): Liver or Bone? InterpreterWork out where a raised alkaline phosphatase (ALP) is coming from when the rest of the liver tests are normal. Enter the ALP and your laboratory's upper limit, then the GGT or 5′-nucleotidase and the context — pregnancy, childhood, a recent fracture, known bone disease — and the page gives the likely source (liver, bone or placenta) and the next test, following the 2018 British Society of Gastroenterology guideline.
- Raised Bilirubin, Normal Liver Tests: Gilbert’s or Haemolysis?Explain an isolated raised bilirubin in an adult whose liver enzymes are normal. Enter the total and direct (conjugated) bilirubin and the upper limit, and the page gives the conjugated fraction, then uses anaemia and haemolysis markers and the drug history to decide between Gilbert's syndrome, haemolysis, a drug effect and a conjugated hyperbilirubinaemia that needs investigating — following the 2018 British Society of Gastroenterology guideline. Adults only.
- Ranson’s Criteria CalculatorScore acute pancreatitis severity on the correct parameter set for the aetiology, with the admission and 48-hour subtotals shown separately.
- Rockall Score CalculatorRockall's risk score for acute upper gastrointestinal haemorrhage, with the pre-endoscopy subtotal beside the full score. Comorbidity scores 0, 2 or 3 and stigmata 0 or 2 — neither item has a 1-point option.
- Rutgeerts Score Interpreter for Postoperative Crohn’s DiseaseFive endoscopic grades at the neoterminal ileum after an ileocolonic resection. In a 365-patient cohort, cumulative clinical recurrence ran 28%, 35%, 49%, 64% and 84% from i0 to i4.
- Truelove and Witts Severity Interpreter1955, and still the definition of an acute severe attack. It does not add up to anything: six or more bloody stools a day PLUS any one systemic feature. Six stools alone is not severe.
- UKELD Score CalculatorThe United Kingdom End-Stage Liver Disease score — INR, creatinine, bilirubin and sodium in SI units, with no clamping anywhere, and a listing threshold of 49 for adults without hepatocellular carcinoma.