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5 Gastroenterology & Hepatology Calculators – MELD, Child-Pugh, APRI & SAAG

Gastroenterology and hepatology calculators include version-specific liver severity scores, a cirrhosis classification, laboratory and fibrosis-related indices, and paired serum–ascites albumin arithmetic.

Preserve the selected model version, laboratory method, specimen pairing, and population boundary; similar liver-related outputs are not interchangeable.

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Which tool fits this task?

Compare the purpose, inputs, and returned measure before opening a calculator. These distinctions describe tool scope; they do not make a diagnosis or choose treatment.

Liver severity models

These two tools have different populations, inputs, model versions, and output identities; they are not interchangeable.

MELD 3.0, MELD-Na & Classic MELD Calculator

Use when
Use the selected current or historical MELD model in its version-specific allocation or clinical context.
Inputs
Version-specific bilirubin, INR, creatinine, sodium, albumin, age, sex, and renal-support inputs.
Returns
A model-specific MELD score within the page's bounds.
Distinction
Current OPTN model identity and historical MELD variants must not be blended into one score.

Child-Turcotte-Pugh (CTP) Score Calculator

Use when
Classify established cirrhosis with the five-domain Child-Turcotte-Pugh assessment.
Inputs
Bilirubin, albumin, INR or PT, ascites, and encephalopathy categories.
Returns
CTP points and class A, B, or C.
Distinction
It is a cirrhosis classification with subjective domains, not a MELD conversion or universal survival probability.

Choose a calculator by task

Use the task groups below to find the calculator whose formula, intended population, required measurements, and purpose match the task.

Liver severity and allocation-related scores

Use the specified current or historical MELD model, or Child-Pugh in its established-cirrhosis assessment context.

MELD 3.0, MELD-Na & Classic MELD CalculatorCalculate current OPTN MELD 3.0 or reproduce historical MELD-Na and classic MELD using version-specific inputs, bounds and limitations.Child-PughChild-Turcotte-Pugh (CTP) Score CalculatorCalculate the standard five-domain Child-Turcotte-Pugh score and class for established cirrhosis using bilirubin, albumin, INR or PT prolongation, ascites, and encephalopathy.

Fibrosis and laboratory indices

Calculate APRI or the De Ritis AST/ALT ratio as source-limited laboratory indices without assigning a diagnosis.

AST-to-Platelet Ratio Index (APRI) CalculatorCalculate APRI from same-assessment AST, the reporting laboratory’s AST upper limit, and platelet count, with current HCV/HBV context and non-diagnostic limits.AST/ALT RatioDe Ritis Ratio (AST/ALT) CalculatorCalculate the unitless AST-to-ALT ratio from a same-panel pair reported in U/L, with laboratory and non-diagnostic limitations.

Ascites-fluid arithmetic

Calculate SAAG only from serum and ascitic-fluid albumin values collected at the required corresponding time point.

Serum-Ascites Albumin Gradient (SAAG) CalculatorCalculate the signed SAAG from same-day serum and ascitic-fluid albumin, with independent units and non-diagnostic interpretation limits.

Match the liver or ascites question

  • Distinguish current OPTN MELD 3.0 from historical MELD-Na and classic MELD before entering version-specific inputs.
  • Use Child-Pugh only in its stated established-cirrhosis context and preserve the selected coagulation measure.
  • For SAAG, pair serum and ascitic-fluid albumin measurements from the corresponding assessment and use compatible units.

Important limits

  • APRI and the De Ritis ratio cannot establish liver disease, fibrosis stage, etiology, or prognosis on their own.
  • A score or gradient does not replace clinical assessment, laboratory trends, imaging, pathology, or applicable program rules.
  • These pages do not determine transplant allocation or eligibility, medication, surveillance, referral, or treatment.

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