1. Use of White Blood Cell Count and Polymorphonuclear Leukocyte Differential to Improve the Predictive Value of Ultrasound for Suspected Appendicitis in Children 
Seema P. Anandalwar, MD, Michael J. Callahan, MD, Richard G. Bachur, MD, Christina Feng, MD, Feroze Sidhwa, MD, Mahima Karki, BA, George A. Taylor, MD, Shawn J. Rangel, MD, MSCE, FACS 
Journal of the American College of Surgeons 
Volume 220, Issue 6, Pages (June 2015)
DOI: /j.jamcollsurg
Copyright © 2015 American College of Surgeons Terms and Conditions

2. Figure 1 Assembly of the study cohort. ED, emergency department.
Journal of the American College of Surgeons  , DOI: ( /j.jamcollsurg )
Copyright © 2015 American College of Surgeons Terms and Conditions

3. Figure 2
Relationships among WBC count, polymorphonuclear leukocyte differential (PMN%), and appendicitis for the 5 most common constellations of ultrasound findings in children with suspected appendicitis. Laboratory thresholds were established for all constellations using WBC >9 × 103/μL + PMN% >65% for positive predictive value and WBC ≤9 × 103/μL + PMN% ≤65% for negative predictive value. Patients confirmed to have pathologically proven appendicitis are represented by black squares and those without appendicitis by gray diamonds. 1Primary signs of appendicitis are hyperemia of appendiceal wall or wall thickness >7 mm. 2Secondary signs of appendicitis are fecalith or echogenic fat.
Journal of the American College of Surgeons  , DOI: ( /j.jamcollsurg )
Copyright © 2015 American College of Surgeons Terms and Conditions