This review describes the cumulative incidence (CI) and risk factors of glucocorticoid (GC)-induced diabetes in patients commencing high-dose GC therapy: ≥ 30 mg prednisolone/day. Finally, methods of screening are discussed. In 13 studies, the CI of GC-induced diabetes ranges 12-65%, but with the current diagnostic criteria the CI is assessed to be 30-50%. Risk factors may include high age and high levels of BMI and glycated haemoglobin, respectively, before GC therapy. It is important to acknowledge, that hyperglycaemia in GC therapy is more prevalent postprandially, and screening should be planned accordingly.