Variation in imaging outcomes associated with individual sonographers and radiologists in pediatric acute appendicitis: a retrospective cohort of 9271 examinations.

• Individual sonographers and radiologists are significantly and independently associated with appendix visualization by ultrasound in children with suspected acute appendicitis. • Frequency of appendix visualization per sonographer demonstrated significant and wide variability across 31 sonographers, ranging from 40.9 to 76.0%. • Fewer than 10% of patients with an ultrasound examination for suspected acute appendicitis underwent CT imaging within the following 24 h. Individual radiologists and sonographers were not predictive of CT utilization within 24 h.