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Child-Pugh Calculator

The Child-Pugh score quantifies the degree of hepatic decompensation in cirrhotic patients by combining five clinical and laboratory variables. Hepatologists, gastroenterologists, and surgeons use it to estimate disease progression, survival probability, and surgical candidacy. Though the MELD score has superseded it for transplant prioritisation, Child-Pugh remains essential for everyday risk stratification and treatment planning in cirrhosis management.

Last updated:

Creators Małgorzata Koperska, MD
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How to Use This Calculator

Enter five key parameters from your patient's most recent assessment to generate an automated Child-Pugh score.

  • Bilirubin: Input total serum bilirubin in either mg/dL or µmol/L; the calculator converts between units automatically.
  • Albumin: Select the appropriate serum albumin range from the latest blood work, measured in g/dL.
  • INR: Choose the International Normalised Ratio bracket. Cirrhotic patients often display markedly prolonged INR due to impaired synthetic function.
  • Ascites: Determine presence and severity based on clinical examination, noting whether ascites responds to diuretic therapy.
  • Encephalopathy: Grade neuropsychiatric involvement using the West Haven criteria (see below for detailed grading).

The calculator sums these components to produce a total score and assigns the patient to Class A, B, or C with associated mortality estimates.

Child-Pugh Scoring Formula

The Child-Pugh score is derived by assigning points to each of five variables. Each parameter contributes between 1 and 3 points depending on severity. The total score determines disease class and prognosis.

Child-Pugh Score = Bilirubin + Albumin + INR + Ascites + Encephalopathy

  • Bilirubin — Serum total bilirubin concentration; elevated levels indicate cholestasis or impaired hepatic clearance.
  • Albumin — Serum albumin level; reduced synthesis reflects compromised hepatic synthetic capacity.
  • INR — International Normalised Ratio; prolongation reflects deficiency of vitamin K-dependent clotting factors.
  • Ascites — Clinical assessment of intra-abdominal fluid accumulation; grades reflect severity and response to therapy.
  • Encephalopathy — Degree of hepatic encephalopathy graded 0–4 per West Haven criteria; reflects ammonia-related neuropsychiatric dysfunction.

Understanding Hepatic Encephalopathy: West Haven Grading

Hepatic encephalopathy arises from portal-systemic shunting and elevated blood ammonia, which damages the central nervous system. The West Haven criteria standardise clinical evaluation across four grades:

  • Grade 0 (None): No clinical signs of encephalopathy; mental status normal.
  • Grade 1 (Subtle): Sleep disturbance, euphoria or mild anxiety, impaired attention, fine tremor. Symptoms may be missed without careful assessment.
  • Grade 2 (Mild): Lethargy, personality change, inappropriate behaviour, dysarthria, ataxia. Patients may appear drowsy but rouse easily.
  • Grade 3 (Moderate): Somnolence, confusion, gross disorientation, bizarre behaviour. Patients respond only to loud or painful stimuli.
  • Grade 4 (Severe): Coma; patient unresponsive to external stimuli.

Serial grading helps track progression and response to treatment with lactulose, rifaxomicin, or branched-chain amino acids.

Score Interpretation and Prognostic Significance

Child-Pugh classification stratifies cirrhotic patients into three risk categories based on total score:

  • Class A (5–6 points): Mild disease; largely preserved hepatic synthetic and detoxifying function. Approximately 100% one-year survival and 85% two-year survival in the original cohort. Patients remain candidates for elective surgery.
  • Class B (7–9 points): Moderate functional impairment; significant risk of decompensation. One-year survival drops to roughly 80% and two-year to 60%. Surgical intervention carries elevated morbidity.
  • Class C (10–15 points): Advanced decompensation; severe hepatic failure. One-year survival approximately 45% and two-year roughly 35%. Only emergency surgery performed; transplantation becomes a priority consideration.

These historical survival figures provide rough estimates; individual outcomes vary based on aetiology, comorbidities, and access to transplantation. Child-Pugh score also informs decisions about portal hypertensive bleeding prophylaxis and candidacy for major surgical procedures.

Clinical Pearls and Common Pitfalls

Accurate Child-Pugh assessment requires careful laboratory interpretation and physical examination.

  1. Ascites grading depends on clinical context — Absence of clinically detectable ascites does not always mean absence of portal hypertension. Ultrasound or CT imaging may reveal small-volume ascites. Conversely, marked abdominal distension in a non-cirrhotic patient is not hepatic ascites. Always correlate with liver disease severity and albumin–bilirubin ratio.
  2. Encephalopathy is subclinical until advanced — Grade 1 and early Grade 2 encephalopathy are easy to miss on routine examination. Formal neuropsychometric testing, psychometric hepatic encephalopathy score (PHES), or critical flicker fusion frequency testing may be required for detection. Do not underestimate mild confusion or mood changes in a cirrhotic patient.
  3. INR elevation reflects multiple factors — Prolonged INR in cirrhosis results from impaired synthesis of vitamin K-dependent factors, not merely vitamin K deficiency. A trial of intravenous vitamin K (phytonadione) may show partial correction, but persistent elevation despite supplementation indicates hepatic dysfunction, not malabsorption.
  4. Laboratory values fluctuate; use trends not single measurements — A single elevated bilirubin or low albumin may reflect acute decompensation or transient illness. Serial measurements over days to weeks provide more reliable assessment of baseline Child-Pugh class. Acute infection, bleeding, or medication changes can temporarily shift score by 1–2 points.

Frequently Asked Questions

What is the difference between Child-Pugh and MELD scores?

MELD (Model for End-Stage Liver Disease) uses creatinine, INR, and bilirubin to predict three-month mortality and is now standard for organ allocation in transplant centres. Child-Pugh incorporates subjective elements (ascites, encephalopathy) and better reflects overall cirrhosis severity and surgical fitness. MELD excels at predicting short-term mortality; Child-Pugh better captures chronic disease burden. Many clinicians use both: MELD for transplant urgency, Child-Pugh for general prognostication and operability decisions.

How often should I recalculate a patient's Child-Pugh score?

Recalculate whenever significant clinical change occurs: new ascites, encephalopathy onset, acute variceal bleeding, or routine follow-up every 3–6 months in stable patients. After a decompensating event (infection, gastrointestinal bleed), reassess within 1–2 weeks as the score often improves with treatment. Do not use outdated scores for major decisions; always obtain current lab work and physical examination.

Can Child-Pugh score guide decisions about elective surgery in a cirrhotic patient?

Yes. Class A patients tolerate elective surgery reasonably well, though perioperative risk remains higher than non-cirrhotic controls. Class B patients face substantial risk; surgery should be deferred unless urgent. Class C patients are poor surgical candidates except for transplantation or life-saving emergency procedures. Always combine Child-Pugh class with procedure-specific factors, cardiac function, and anaesthetic assessment before proceeding.

What causes persistently high bilirubin in Child-Pugh scoring?

Elevated bilirubin reflects impaired hepatocellular extraction, conjugation, or excretion. In cirrhosis, this results from architectural disruption, reduced hepatocyte mass, and intrahepatic shunting of blood. Cholestasis from ductular obstruction (stones, tumour) or sepsis worsens levels. Some patients develop pigment gallstones, worsening obstruction. Treating the underlying cause (draining infection, managing portal hypertension) may help, but significant elevations typically signal advanced disease.

Is albumin in the Child-Pugh score affected by nutritional status alone?

No. While malnutrition contributes to low albumin, cirrhotic patients often have depressed albumin despite adequate intake because hepatic synthetic capacity is compromised. Portal hypertension increases albumin loss into ascitic fluid. Infection, inflammation, and renal loss also lower levels. A low albumin in cirrhosis indicates hepatic failure, not simple protein deficiency. Albumin supplementation does not reliably restore synthesis; treatment must address underlying liver disease.

How does ascites treatment affect the Child-Pugh score?

Successful diuretic therapy or paracentesis reduces clinical ascites, lowering the ascites component from 2–3 points to 1 point. However, this improvement does not reflect better liver function; it reflects temporary fluid control. The underlying fibrosis and portal hypertension persist. A patient whose ascites improves may still have identical bilirubin, albumin, INR, and encephalopathy grades, so the score may drop only 1–2 points. Do not assume major improvement in prognosis from ascites reduction alone.

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