Pre-OP Assessment

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Aim is to minimize risk for all patients + identify patients at particular risk.

Preop assessment allows optimization of the patient, reduce cancellation on day of surgery, improve patients experience and may reduce morbidity and mortality.  From the assessment patients should be assigned an ASA score. 

  • ASA 1 - A normal healthy patient
  • ASA 2 A patient with mild systemic disease
  • ASA 3 A patient with severe systemic disease
  • ASA 4 A patient with severe systemic disease that is a constant threat to life

The following are guidelines to fasting periods to reduce risk of aspiration during assessment. 

Ingested material 

Minimum fasting period 

Clear liquids 

2h   (1 hour in children)

Breast milk 

4h 

Infant formula  

6h 

Solids  

6h