Protocol A-Conservative Management: On admission to hospital all pre-operative oral antidiabetic agents and insulin are stopped and glucose monitoring is carried out every four hours at the same time as routine observations. Actrapid insulin is administered with glucose as per standard sliding scale (Appendix A). Just prior to discharge, total insulin administered over the previous 24 hour post-operative period is calculated. Based on the results of ward based glucose monitoring, post-operative patients can be divided in two broad categories.