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Risk factors for inadvertent perioperative hypothermia. Patients should be managed as high risk if two or more of the following apply
| ASA grade 2–5 (the higher the grade, the greater the risk) |
| Preoperative temperature <36.0°C (and preoperative warming is not possible because of clinical urgency) |
| Undergoing combined general and regional anaesthesia |
| Undergoing major or intermediate surgery |
| At risk of cardiovascular complications |
| Low BMI |
