Preanaesthetic blood tests in cats and dogs older than 8 years: anaesthetists' prediction and peri-anaesthetic changes.

Objective: To evaluate the anaesthetist's ability to predict abnormalities in preanaesthetic blood test results obtained from cats and dogs older than 8 years and to describe the impact of these preanaesthetic blood test results on the American Society Anesthesiologists (ASA) physical status classification, anaesthetic protocol and procedures.

Study Design: Observational, prospective, clinical multi-centre study.

Animals: A total of 333 cats and dogs.