Table 7.1-1. Classification of dysfunction of the sphincter of Oddi

Type

Criteria

Biliary type

I

Pain + all additional criteria met:

1) Elevated (≥2 × ULN) serum AST, ALT, ALP, or bilirubin levels found on ≥2 occasions

2) Common bile duct dilated >8 mm found on ultrasonography

II

Pain + 1 additional criterion met

III

Only biliary-type pain (as in choledocholithiasis)

Pancreatic type

I

Pain + all additional criteria met:

1) Elevated serum ­amylase or lipase levels found on ≥2 occasions

2) Pancreatic duct dilated >6 mm in head of the pancreas and >5 mm in tail

II

Pain + 1 additional criterion met

III

Only pancreatic-type pain

ALP, alkaline phosphatase; ALT, alanine aminotransferase; AST, aspartate aminotransferase; ULN, upper limit of normal.