While most children with COVID-19 are asymptomatic or have mild symptoms, healthcare providers have difficulty determining which of their pediatric patients will progress to moderate or severe COVID-19 early in the progression. Some of these patients develop multisystem inflammatory syndrome in children (MIS-C), a life-threatening inflammation of organs and tissues. Methods to distinguish children at risk for severe COVID-19 complications, including conditions such as MIS-C are needed for earlier interventions to improve pediatric patient outcomes.