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Updated: May 23, 2026

Focused Assessment with Sonography for Trauma (FAST) Exam: Image Acquisition
Published on: September 22, 2023
Blunt abdominal trauma in children
Deborah Schonfeld1, Lois K Lee
1Division of Emergency Medicine, Children's Hospital, Boston, Harvard Medical School, Boston, Massachusetts, USA.
Insights
Diagnosing intra-abdominal injuries (IAI) in pediatric blunt abdominal trauma requires careful evaluation. While the FAST exam aids in identifying at-risk children, normal physical exams and CT scans may preclude the need for hospitalization.
Area of Science:
- Pediatric Surgery
- Emergency Medicine
- Trauma Care
Background:
- Blunt abdominal trauma is a significant concern in pediatric patients.
- Accurate diagnosis of intra-abdominal injuries (IAI) is crucial for appropriate management.
- Current diagnostic strategies involve physical examination, laboratory tests, and imaging modalities.
Purpose of the Study:
- To review the evidence on physical exam findings, laboratory values, and imaging in diagnosing pediatric blunt abdominal trauma.
- To examine literature on pediatric hollow viscus injuries.
- To discuss emergency department disposition after IAI diagnosis.
Main Methods:
- Comprehensive literature review of pediatric blunt abdominal trauma.
- Analysis of diagnostic tools including physical exam, laboratory screening, and imaging (FAST, CT).
- Evaluation of management strategies and disposition criteria for suspected IAI.
Main Results:
- The utility of the seat belt sign and screening labs for IAI is debated; hepatic enzymes are recommended for nonaccidental trauma.
- Focused Assessment with Sonography for Trauma (FAST) has limited sensitivity for hemoperitoneum and IAI in pediatric trauma.
- Hospital admission with serial exams is safe for patients with suspected IAI if emergent laparotomy is not indicated.
Conclusions:
- The FAST exam, combined with physical exam and labs, can help identify children at risk for IAI but is not a sole screening tool.
- Hemodynamically stable pediatric trauma patients with normal physical exams and abdominal CT scans may not require routine hospitalization.
Purpose Of Review:
This review will examine the current evidence regarding pediatric blunt abdominal trauma and the physical exam findings, laboratory values, and radiographic imaging associated with the diagnosis of intra-abdominal injuries (IAI), as well as review the current literature on pediatric hollow viscus injuries and emergency department disposition after diagnosis.
Recent Findings:
The importance of the seat belt sign on physical examination and screening laboratory data remains controversial, although screening hepatic enzymes are recommended in the evaluation of nonaccidental trauma to identify occult abdominal organ injuries. Focused Assessment with Sonography for Trauma (FAST) has modest sensitivity for hemoperitoneum and IAI in the pediatric trauma patient. Patients with concern for undiagnosed IAI, including bowel injury, may be considered for hospital admission and serial abdominal exams without an increased risk of complications, if an exploratory laparotomy is not performed emergently.
Summary:
Although the FAST exam is not recommended as the sole screening tool to rule out IAI in hemodynamically stable trauma patients, it may be used in conjunction with the physical exam and laboratory findings to identify children at risk for IAI. Children with a normal physical exam and normal abdominal CT may not require routine hospitalization after blunt abdominal trauma.
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