RT Journal Article SR Electronic T1 How to interpret cardiac biomarkers in children? JF Archives of disease in childhood - Education & practice edition JO Arch Dis Child Educ Pract Ed FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP edpract-2022-324466 DO 10.1136/archdischild-2022-324466 A1 McGinn, Claire A1 Waterfield, Thomas A1 McKeeman, Gareth A1 Morrison, Louise A1 Callaghan, Sinead A1 Watson, Chris A1 Casey, Frank A YR 2022 UL http://ep.bmj.com/content/early/2022/11/22/archdischild-2022-324466.abstract AB Cardiac biomarkers are used as first-line diagnostic tools in suspected myocardial injury and heart failure in adult patients. Their use in paediatric patients has been limited by variability caused by age, gender and the presence of an underlying congenital cardiac condition. There are established reference ranges for both NT-proBNP and troponin in healthy children, but these cannot be applied to all paediatric patients because of limited large studies focusing on children with congenital heart disease and/or cardiomyopathy.This article will focus on the pathophysiology of myocardial injury and heart failure in children and the subsequent cardiac biomarker correlation. It will explain how to interpret the biomarker assay levels obtained for both troponin and NT-proBNP and highlights the importance of a clear clinical question prior to requesting a cardiac biomarker assay level.Clinical cases outline scenarios that may prompt consideration of biomarker analysis in children and aims to equip the reader with an understanding of how to interpret the results.