Child-Pugh-Turcot (CPT) Score Calculator
Use this clinical tool to calculate the Child-Pugh-Turcot (CPT) score for patients with chronic liver disease and cirrhosis. The CPT score is a validated classification system used to assess prognosis, estimate the severity of hepatic dysfunction, determine surgical mortality risk, and guide therapeutic decisions, such as the timing of liver transplantation.
The Evolution of the Score
Originally described by Dr. Charles Gardner Child and Dr. Jeremiah G. Turcot in 1964 to predict surgical outcomes during portal decompression surgery, the system was later modified by Pugh and colleagues in 1973. Pugh replaced the original subjective parameter of nutritional status with the more quantifiable metric of prothrombin time (or INR), creating the modern Child-Pugh-Turcot framework utilized today.
The Five Clinical and Biochemical Parameters
The score evaluates liver function by assigning 1, 2, or 3 points to each of five parameters, comprising three objective biochemical tests and two clinical assessments:
1. Total Bilirubin
1 Point: Less than 2.0 mg/dL (Less than 34 micromol/L)
2 Points: 2.0 to 3.0 mg/dL (34 to 51 micromol/L)
3 Points: Greater than 3.0 mg/dL (Greater than 51 micromol/L)
2. Serum Albumin
1 Point: Greater than 3.5 g/dL
2 Points: 2.8 to 3.5 g/dL
3 Points: Less than 2.8 g/dL
3. Prothrombin Time (PT) Prolongation or INR
1 Point: INR less than 1.7 (or PT prolonged by less than 4 seconds)
2 Points: INR 1.7 to 2.3 (or PT prolonged by 4 to 6 seconds)
3 Points: INR greater than 2.3 (or PT prolonged by more than 6 seconds)
4. Ascites
1 Point: None
2 Points: Mild / Controlled with diuretics
3 Points: Moderate to Severe / Refractory to medical therapy
5. Hepatic Encephalopathy
1 Point: None
2 Points: Grade 1 or 2 (Mild confusion, slurred speech, asterixis)
3 Points: Grade 3 or 4 (Severe confusion, stupor, coma)
Clinical Staging and Interpretation
The scores from all five categories are added to produce a total score ranging from 5 to 15. This total score categorizes the patient into one of three Child-Pugh Classes, which directly correlate with survival rates and surgical risk:
Child-Pugh ClassTotal Score1-Year Survival2-Year SurvivalClinical DescriptionClass A5 to 6~100%~85%Well-compensated liver diseaseClass B7 to 9~80%~60%Significant functional impairmentClass C10 to 15~45%~35%Decompensated decompensation / Severe disease
Surgical Risk Assessment:
Class A: Demonstrates safe liver reserve; typically tolerates elective non-transplant surgery well.
Class B: Associated with increased perioperative mortality. Elective surgeries require optimization, and drug dosages must be carefully adjusted.
Class C: Carries a highly elevated risk of perioperative mortality (often exceeding 70%). Non-transplant abdominal surgery is generally contraindicated in these individuals.
Limitations of the CPT Score
Subjectivity: Assessing the severity of ascites and hepatic encephalopathy involves subjective clinical judgment, which can vary between providers. Interventions like lactulose or paracentesis can also artificially alter these scores.
Ceiling and Floor Effects: The scoring brackets have strict limits. For instance, a patient with a bilirubin of 3.5 mg/dL receives 3 points, and a patient with a much higher bilirubin of 25 mg/dL also receives 3 points, despite having significantly worse liver function.
Lack of Renal Function: Unlike the Model for End-Stage Liver Disease (MELD) score, the Child-Pugh-Turcot system does not factor in renal performance (such as serum creatinine), which is a critical predictor of mortality in advanced cirrhosis.
Child-Pugh-Turcot References
Child, C. G., & Turcot, J. G. (1964). Surgery and portal hypertension. Major Problems in Clinical Surgery, 1, 1-85.
Pugh, R. N., Murray-Lyon, I. M., Dawson, J. L., et al. (1973). Transection of the oesophagus for bleeding oesophageal varices. British Journal of Surgery, 60(8), 646-649.
Infante-Rivard, C., Esnaola, S., & Villeneuve, J. P. (1987). Clinical and statistical validity of the Child-Turcot-Pugh prognostic classification for liver cirrhosis. Gastroenterology, 92(6), 1775-1781.
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