Clinical Research Directory

Inclusion Criteria: * ≥ 18 years of age * Presenting to the emergency department with abdominal pain with clinical concern for possible acute cholecystitis * Initial biliary US interpreted as normal, equivocal or negative for acute cholecystitis * 2-6 hours since initial biliary ultrasound with ongoing symptoms * General surgery consult placed or additional non-ultrasound advanced imaging ordered * Fluency in English or Spanish Exclusion Criteria: * \< 18 years of age * \> 6 hours since initial biliary US * Asymptomatic/resolved symptoms or pending discharge from the emergency department * Initial ultrasound positive for acute cholecystitis or other findings to explain presenting symptoms * Baseline ascites * Prior cholecystectomy * Unable or unwilling to provide consent * Presenting to a facility other than study site emergency department * Transferred patients from outside facilities