Optimising control of diabetes before surgery

INTERVENTION: On the day of preoperative consultation, HbA1c will be measured. Patients with an HbA1c <53 mmol/mol will proceed to surgery according to standard care. Patients with an HbA1c >=53 mmol/mol will be randomised to an intervention group or control group. Patients in the intervention group will be contacted by a diabetes care nurse for optimisation of their glycaemic control before surgery. Patients in the control group will proceed to surgery according to standard care. CONDITION: Diabetes Mellitus, Perioperative care, Pre‐operative, Glucose, Glucose metabolism ; ; PRIMARY OUTCOME: The primary endpoint of the study will be the number of days at home up to 30 days after surgery (DAH30), which is a single,; pragmatic, patient‐centred outcome. SECONDARY OUTCOME: Secondary outcomes are preoperative and postoperative blood glucose concentrations, incidence of hyperglycaemia and ; hypoglycaemia (glucose >10 mmol/l or <4 mmol/l, respectively) and change from baseline HbA1c, fructosamine, and 1,5‐ ; anhydroglucitol. INCLUSION CRITERIA: ‐ Diabetes mellitus type 2 (diagnosis at least 3 months prior to pre‐operative screening) ‐ Age 18 ‐ 85 years ‐ Elective non‐cardiac surgery ‐ Scheduled for surgery at least 7 days from date of screening ‐ Informed consent