Question special

Hi All, thanks for joining us in discussion in this edition of 'Ask the Experts". To start with, it is common to assess a patient's 'fitness for surgery' prior to elective surgery and there are many different ways of doing this. Many of us will ask patients about their usual physical activity to make a subjective assessment and then potentially proceed to investigations anyway. My question is how useful are subjective assessments? And are there alternative methods for assessment of risk we should be thinking of?