Scope of this summary
Adults with right-upper-quadrant pain and suspected acute biliary disease, or laboratory and imaging features that raise concern for choledocholithiasis. The ACR source governs imaging appropriateness and the ASGE source governs endoscopic risk stratification. Neither source is a complete biliary-colic, antibiotic or operative pathway; pregnancy, pediatric disease, primary sclerosing cholangitis and malignant obstruction are outside this summary.
The Bottom Line
- Use right-upper-quadrant ultrasound as the usual initial examination when acute cholecystitis or another biliary cause of right-upper-quadrant pain is suspected.
- When ultrasound is negative or equivocal, select cholescintigraphy, MRI with MRCP, or CT from the relevant ACR clinical variant; the preferred next test changes with fever, leukocytosis, suspected acalculous disease and the availability of prior imaging.
- ASGE high-risk features that can directly prompt ERCP are a common-bile-duct stone on ultrasound or cross-sectional imaging, ascending cholangitis, or total bilirubin above 4 mg/dL together with a dilated common bile duct.
- For intermediate-risk features—abnormal liver biochemical tests, age above 55 years, or bile-duct dilation without a high-risk combination—use EUS, MRCP, laparoscopic intraoperative cholangiography or intraoperative ultrasound rather than diagnostic ERCP.
- ASGE recommends against urgent ERCP in gallstone pancreatitis when cholangitis and persistent biliary obstruction are absent; the separate acute-pancreatitis pathway governs that presentation.
Practical clinical workflow
1
Define the clinical variant before ordering more imaging: record pain pattern, fever, jaundice and systemic illness; examine for right-upper-quadrant tenderness and obtain bilirubin, aminotransferases, alkaline phosphatase and lipase when the presentation warrants them.
2
Begin with right-upper-quadrant ultrasound for suspected biliary disease and document whether stones, inflammatory features and bile-duct dilation are present; do not treat a nondiagnostic study as exclusion of disease.
3
If acute cholecystitis remains suspected after equivocal ultrasound, use the ACR variant to choose the next study instead of applying one universal sequence to every patient.
4
Apply the ASGE high- and intermediate-risk criteria only when choledocholithiasis is the question, keeping the component findings visible rather than replacing them with an undocumented gestalt score.
5
Use EUS or MRCP to confirm an intermediate-risk duct stone when appropriate; reserve ERCP for a high-probability or therapeutic setting and coordinate definitive gallbladder decisions under a separate current surgical source.
Safety boundaries and escalation
- Ascending cholangitis is an ASGE high-risk presentation and requires emergency specialist assessment and an urgent biliary-decompression pathway rather than routine outpatient imaging.
- ERCP can cause pancreatitis, bleeding, infection and perforation; avoid using it as a low-risk diagnostic substitute when EUS or MRCP can answer an intermediate-risk question.
- The ACR and ASGE documents do not supply a complete antibiotic, analgesic, cholecystectomy-timing or incidental-stone pathway. Those decisions must remain unpublished here until a current exact source is attached.
- Pregnancy, major anticoagulation issues, severe cardiopulmonary disease and surgically altered anatomy change imaging and procedural choices and require source-specific specialist planning.
Localization
The ACR and ASGE documents define US imaging appropriateness and endoscopic risk stratification only. Local surgical capacity and payer authorization affect execution, while antimicrobial and operative recommendations require their own current US sources.
Source documents
Use the linked source documents for complete recommendations, evidence grading, exclusions and implementation detail.
- American College of RadiologyACR Appropriateness Criteria: Right Upper Quadrant Pain — 2022 UpdateDOI 10.1016/j.jacr.2023.02.011 · 2022 update published May 2023 · published 2023-05-01 · accessed 2026-08-20view source
- American Society for Gastrointestinal EndoscopyASGE guideline on the role of endoscopy in the evaluation and management of choledocholithiasisDOI 10.1016/j.gie.2018.10.001 · published 2019-06-01 · accessed 2026-08-20view source
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