Scope of Application
This guideline is intended for physicians working in hospital-based emergency departments.

Inclusion Criteria
This guideline is intended for patients presenting to the ED with acute, nontraumatic abdominal pain and possible or suspected appendicitis.

Exclusion Criteria
This guideline is not intended to address the care of patients with trauma-related abdominal pain, or pregnant patients.

Critical Questions

1. Can clinical findings be used to guide decision-making in the risk stratification of patients with possible appendicitis?
   
   Level B Recommendation:
   
   In patients with suspected acute appendicitis, use clinical findings (ie, signs and symptoms) to risk-stratify patients and guide decisions about further testing (eg, no further testing, laboratory tests, and/or imaging studies) and management (eg, discharge, observation, and/or surgical consultation).
   
   
   
2. In adult patients with suspected acute appendicitis who are undergoing a CT scan, what is the role of contrast?
   
   Level B Recommendation:
   
   In adult patients undergoing a CT scan for suspected appendicitis, perform abdominal and pelvic CT scan with or without contrast (intravenous [IV], oral, or rectal). The addition of IV and oral contrast may increase the sensitivity of the CT scan for the diagnosis of appendicitis.
   
   
   
3. In children with suspected acute appendicitis who undergo diagnostic imaging, what are the roles of CT and ultrasound in diagnosing acute appendicitis?
   
   Level B Recommendations:
   
   (1) In children, use ultrasound to confirm acute appendicitis but not to definitively exclude acute appendicitis.
   
   (2) In children, use an abdominal and pelvic CT to confirm or exclude acute appendicitis.
   
   Level C Recommendation:
   
   Given the concern over exposing children to ionizing radiation, consider using ultrasound as the initial imaging modality. In cases in which the diagnosis remains uncertain after ultrasound, CT may be performed.
   
   
   

Disclaimer
Recommendations offered in this policy are not intended to represent the only diagnostic and management options that the emergency physician should consider. ACEP recognizes the importance of the individual physician's judgment and patient preferences.