Child-Pugh Score Table: Diagnostic Criteria & Point Assignment Matrix

Authoritative diagnostic table and scoring matrix for the Child-Pugh score, displaying standard and cholestatic criteria for 1, 2, and 3 points.

The Child-Pugh scoring table is one of the most referenced diagnostic matrices in clinical medicine. By mapping five distinct clinical and biochemical indicators to standardized 1, 2, or 3-point categories, the table enables rapid bedside stratification of chronic liver disease severity. This guide details every parameter cutoff across standard cirrhosis and cholestatic liver diseases (PBC/PSC), explaining the biochemical rationale behind each threshold and how to apply the matrix accurately using tools like our ctp calculator.

The Complete Child-Pugh Scoring Matrix

The standardized Child-Pugh scoring table allocates points as follows across the five core variables:

1. Total Bilirubin (Standard Cirrhosis): <2.0 mg/dL (<34 µmol/L) = 1 point; 2.0 to 3.0 mg/dL (34 to 50 µmol/L) = 2 points; >3.0 mg/dL (>50 µmol/L) = 3 points.

2. Total Bilirubin (Cholestatic PBC/PSC Variant): <4.0 mg/dL (<68 µmol/L) = 1 point; 4.0 to 10.0 mg/dL (68 to 170 µmol/L) = 2 points; >10.0 mg/dL (>170 µmol/L) = 3 points.

3. Serum Albumin: >3.5 g/dL (>35 g/L) = 1 point; 2.8 to 3.5 g/dL (28 to 35 g/L) = 2 points; <2.8 g/dL (<28 g/L) = 3 points.

4. Coagulation Profile: International Normalized Ratio (INR) <1.7 = 1 point; 1.7 to 2.3 = 2 points; >2.3 = 3 points. Alternatively, Prothrombin Time (PT) prolongation above normal control: <4.0 seconds = 1 point; 4.0 to 6.0 seconds = 2 points; >6.0 seconds = 3 points.

5. Ascites Severity: None = 1 point; Mild or medically controlled with diuretics = 2 points; Moderate to severe, tense, or refractory requiring paracentesis = 3 points.

6. Hepatic Encephalopathy (West Haven): None (Grade 0) = 1 point; Grade 1 or 2 (mild confusion, asterixis) = 2 points; Grade 3 or 4 (marked somnolence, stupor, coma) = 3 points.

Class Assignment and Total Score Ranges

Summing the points across all five rows yields a total score ranging from a minimum of 5 to a maximum of 15 points:

• Score 5 to 6: Child-Pugh Class A (Compensated cirrhosis). Preserved synthetic reserve; 1-year survival ~100%; elective abdominal surgical mortality ~10%.

• Score 7 to 9: Child-Pugh Class B (Moderate functional impairment). Clinical decompensation present; 1-year survival ~80%; elective abdominal surgical mortality ~30%.

• Score 10 to 15: Child-Pugh Class C (Severe decompensation). End-stage disease; 1-year survival ~45%; elective non-transplant surgery contraindicated (mortality 70%–82%).

Biochemical and Physiological Validation of Thresholds

The historical cutoffs in the Child-Pugh matrix were not chosen arbitrarily; they reflect profound physiological tipping points in hepatic function:

• The 2.0 mg/dL Bilirubin Cutoff: In healthy humans, total bilirubin is maintained tightly between 0.2 and 1.2 mg/dL. A serum bilirubin exceeding 2.0 mg/dL produces visible scleral icterus and cutaneous jaundice, indicating that biliary canalicular excretion has been overwhelmed.

• The 3.5 g/dL Albumin Cutoff: Albumin concentrations >3.5 g/dL indicate adequate ongoing hepatocyte synthesis. A fall below 2.8 g/dL reflects severe, chronic loss of functional hepatocyte mass combined with systemic hypercatabolism and peritoneal transudation.

• The 1.7 INR Cutoff: An INR <1.7 signifies adequate hepatic synthesis of short-half-life clotting factors (Factor VII). An INR >2.3 reflects critical hemostatic failure, warning clinicians of severe parenchymal dysfunction.

Practical Guidelines for Table Application

When applying the child pugh score calculator table in hospital or outpatient practice, clinicians must observe several quality guidelines. First, verify whether the patient has received recent exogenous albumin infusions (e.g., following large-volume paracentesis or for hepatorenal syndrome), as this will transiently elevate serum albumin and underestimate score severity.

Second, determine whether the patient is taking oral anticoagulants (warfarin or DOACs) or has baseline consumptive coagulopathy from sepsis, as this artificially elevates INR. Finally, evaluate whether the patient has primary biliary cholangitis or primary sclerosing cholangitis, in which case the expanded cholestatic bilirubin cutoffs must be utilized.

Clinical takeaways

  • 5 variables, each scored 1, 2, or 3 points (Total score 5–15).
  • Always check for cholestatic disease (PBC/PSC) to apply modified bilirubin cutoffs.
  • Classes: A (5–6), B (7–9), C (10–15).

Limitations

  • Categorical boundaries create artificial step-offs (e.g., albumin 3.6 g/dL vs. 3.5 g/dL).
  • Subjective grading of ascites and encephalopathy introduces inter-rater variation.

References

  1. Pugh RN, et al. Br J Surg. 1973;60(8):646-649.