Observation first may spare children an abdominal CT

Clinical takeaway: In hemodynamically stable children whose need for abdominal CT is uncertain, consider structured observation with serial examinations and selective adjunctive testing before committing to imaging.

For children at intermediate risk after blunt abdominal trauma, serial reassessment may reduce avoidable radiation exposure while preserving diagnostic safety.

Researchers analyzed 7,442 children with blunt abdominal trauma enrolled prospectively at 6 pediatric trauma centers. Clinicians chose observation with deferred CT decision-making for 2,024 children, or 27% of the cohort. Because observation was not randomly assigned, the results show an association rather than proof that observation caused the reduction in imaging.

Abdominal CT was performed in 20.5% of observed children versus 37.1% of those managed without observation—an absolute reduction of nearly 17 percentage points. After adjustment for age, study site, PECARN abdominal-trauma variables, and clinician-estimated injury risk, observation was most strongly associated with reduced CT use when clinicians estimated a 1% to 50% probability of intra-abdominal injury. In these intermediate-risk groups, the adjusted odds of CT were approximately 69% to 85% lower with observation.

Among observed children, 0.4% had an intra-abdominal injury requiring acute intervention; all were recognized during observation, with the longest interval before CT just over 5 hours. Of 1,166 children discharged after observation without CT, none subsequently required an acute intervention. One returned 2 days later with a duodenal hematoma but recovered after an uncomplicated overnight hospitalization without a procedure.

Observation added relatively little time overall: median ED stay was approximately 27 minutes longer than without observation. The strategy was unstructured, however, and the study did not determine the optimal observation duration or combination of serial examinations, laboratory testing, and ultrasound.

“Taking time to observe a child’s clinical course…can meaningfully guide our imaging decisions and spare children unnecessary radiation, without putting them at risk,” said study coauthor Jeffrey S. Upperman, MD.

Source: Ishimine P, et al. (2026 August) Ann Emerg Med. Emergency Department Observation and Computed Tomography Use in Children With Blunt Abdominal Trauma