Cardiopulmonary physiotherapy (CPT) is an important component of peri-operative care received by children who have undergone upper abdominal, thoracic or cardiac surgery. There is no tool in the literature to determine a paediatric patient's readiness for discharge from CPT. In this study, a paediatric CPT discharge tool was developed using a modified Delphi technique. The Delphi panel included paediatric physiotherapy clinicians and academic leaders in the area of CPT. The draft of the tool includes six clinical phenomena and their criterion definition(s). Preliminary sensibility testing revealed promising results. The global mean of all sensibility domains was 6.4 (median = 6.6) of a possible 7.0. The formatting of the tool was modified to improve clarity and simplicity based on feedback received during the sensibility assessment. Future research is required to test the reliability of individual items in the tool, develop a scoring method, and evaluate the predictive validity of the tool.