Crittenden JP, Dattilo JB. Sphincter of Oddi Dysfunction. 2021 Feb 23. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2021 Jan–.
The patient’s presentation, in combination with the results of their examination, should be used to stratify them to into three classes of sphincter of Oddi dysfunction. Specific diagnostic criteria for SOD include:
- Transaminitis (greater 2 times the upper limit of normal on 2 or more occasions)
- Common bile duct dilation (greater than 10 mm on US; greater than 12 mm on ERCP)
- Biliary pain
Utilizing these criteria, patients are classified as follows:
Type I SOD: all three
Type II SOD: biliary pain and one of the other two criteria.
Type III SOD: biliary pain only 
The results of this classification will impact the subsequent treatment plan.Continue reading