Liver Stone Risk Calculator

The Liver Stone Calculator estimates the clinical statistical association with hepatolithiasis (intrahepatic bile duct stones) based on established risk factors. This tool helps clinicians and patients assess the likelihood of stones using age, medical history, and biliary health. Whether you are reviewing post-surgical history or assessing recurrent symptoms, this tool provides a preliminary risk score to guide further diagnostic evaluation.

Age must be between 1 and 120 years.
Patient's age in years
Previous documented bile duct infection
History of biliary tract surgery (e.g., choledochojejunostomy)
Presence of bile duct narrowing on imaging
History of recurrent gallstones
Screen ford chronic liver disease or cirrhosis

How Risk Score Is Calculated

The risk score is calculated using a point-based system derived from common epidemiological risk factors found in hepatobiliary literature. Each factor contributes a specific weight to the total score based on its clinical significance.

Risk Score = Age Factor + Cholangitis + Surgery + Stricture + Gallstones + Liver Disease

Point Assignments:

  • Age ≥ 50 years: +1 point
  • History of Cholangitis: +2 points
  • Previous Biliary Surgery: +2 points
  • Biliary Stricture: +2 points
  • Recurrent Gallstones: +1 point
  • Chronic Liver Disease: +2 points

What Your Risk Score Means

The total points correlate to a risk category that helps determine the next clinical steps. Higher scores indicate a greater likelihood of intrahepatic stones.

Score Range Risk Category Implication
0–2 Lower statistical association Risk factors are minimal. Routine monitoring is generally sufficient unless symptoms develop.
3–5 Moderate Risk Presence of significant clinical indicators. Discuss imaging options (Ultrasound or MRCP) with a specialist.
≥ 6 Higher statistical association Strong probability of hepatolithiasis. Comprehensive diagnostic evaluation (CT/MRCP) is typically recommended.

Pro Tip

Recurrent abdominal pain in the right upper quadrant combined with fever or jaundice in a patient with a history of biliary surgery significantly raises the pre-test probability of hepatolithiasis, regardless of the calculated score.

Related Calculators

Calculation logic verified using publicly available standards.

View our Accuracy & Reliability Framework →