1. O’Neill F, Carter E, Pink N, Smith I. Routine preoperative tests for elective surgery: summary of updated NICE guidance. BMJ 2016; 354: doi: https://doi.org/10.1136/bmj.i3292.
  2. NICE Guidelines (2016) Routine preoperative tests for elective surgery [NG45].
  3. Klein AA, Arrowsmith JE. Should routine preoperative testing be abandoned? Anaesthesia 2010; 65: 974-76.
  4. Association of Anaesthetists of Great Britain and Ireland (2010) Pre-operative assessment and patient preparation: the role of the anaesthetist
  5. ASA Physical Status Classification System: https://www.asahq.org/standards-and-guidelines/asa-physical-status-classification-system.

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