For acute cholecystitis, US had a sensitivity and specificity of 26% and 80%. HIDA scan had a sensitivity and specificity of 87% and 79%.
Glucose >140 mg/dL, age >50, and WBC count >10 (×109 /L) were independent clinical features associated with histologically confirmed acute cholecystitis.
Delayed HIDA scan protocol resulted in increased time to surgery, length of stay, and increased costs.