Cystic fibrosis related diabetes (CFRD) is the most common secondary complication of Cystic fibrosis. It affects nearly 20% of adolescents and 40-50% of adults. Undiagnosed CFRD is associated with significant decline in lung function and nutritional status with an increase in mortality. This emphasises the importance of screening for CFRD in children with CF to minimise the nutritional and pulmonary consequences of diabetes.