Abstract 4143723: Thrombocytosis is Prevalent and Associated with Greater Inflammation and Coronary Artery Involvement in Both Kawasaki Disease and Multisystem Inflammatory Syndrome in Children Associated with COVID-19

Introduction: Thrombocytosis, sometimes extreme, after acute Kawasaki disease (KD) is common and felt to be pathognomonic of this diagnosis, although has also been reported after multisystem inflammatory syndrome in children (MIS-C), a clinically similar condition. We sought to determine differences in factors associated with thrombocytosis for each condition. Methods: From 01/2020 to 10/2023 across 41 sites in 8 countries from the …