Management of Right Upper Quadrant Pain

Initial Clinical Assessment

The American Academy of Family Physicians recommends obtaining an abdominal ultrasound immediately as the first-line imaging study for any patient presenting with right upper quadrant pain 1, 2
Document pain characteristics, including onset, duration, quality, severity, and radiation, as biliary colic typically radiates to the right shoulder or back 2
Record associated symptoms, including fever, nausea, vomiting, jaundice, and changes in bowel habits 2
Obtain medication history from the past 6 weeks, including prescription drugs, over-the-counter medications, and herbal supplements 2
Document alcohol intake and any history of biliary disease, prior biliary surgery, or liver disease 2
Check vital signs for fever, tachycardia, or hypotension, suggesting infection or sepsis 2
Assess for right upper quadrant tenderness 1, 2
Elicit Murphy's sign, which is highly suggestive of acute cholecystitis 2, 3
Examine for hepatomegaly, splenomegaly, abdominal distension, masses, or peritoneal signs 2

Complete blood count to assess for leukocytosis 2
Liver function tests, including ALT, AST, alkaline phosphatase, GGT, and bilirubin 2
Pancreatic enzymes, such as amylase and lipase, to exclude pancreatitis 2
Pregnancy test for all women of reproductive age before imaging 1, 2

Ultrasound is the primary imaging modality with 96% accuracy for diagnosing gallstones and should be performed first in all patients with RUQ pain 1, 2
Ultrasound can identify gallstones, gallbladder wall thickening, pericholecystic fluid, and sonographic Murphy sign 2, 3
CT abdomen with IV contrast should be performed when ultrasound findings are equivocal or nondiagnostic, or when complications of cholecystitis are suspected 3, 4
CT provides superior detection of gallbladder wall enhancement, adjacent liver parenchymal hyperemia, and complications such as perforation, gas formation, and intraluminal hemorrhage 3, 4
Cholescintigraphy (Tc-99m hepatobiliary scan) should be considered when ultrasound and clinical findings remain equivocal for acute cholecystitis 1, 4
MRI abdomen with MRCP may be used when other imaging tests are equivocal, the patient is difficult to examine with ultrasound, or detailed evaluation of the biliary tree is needed 3, 4

Do not skip ultrasound and proceed directly to CT, as ultrasound provides rapid, cost-effective diagnosis and avoids radiation exposure 1, 2
Do not order CT without IV contrast for suspected cholecystitis, as important findings like wall enhancement and liver hyperemia cannot be detected without contrast 3, 4
CT has only 75% sensitivity for gallstones, so negative CT does not exclude cholelithiasis 4