Most preoperative tests (typically a complete blood count, Prothrombin Time and Partial Prothomboplastin Time, basic metabolic panel and
urinalysis) performed on elective surgical patients are normal. Findings influence management in under 3% of patients tested. In almost all cases,
no adverse outcomes are observed when clinically stable patients undergo elective surgery, irrespective of whether an abnormal test is identified.
Preoperative testing is appropriate in symptomatic patients and those with risks factors for which diagnostic testing can provide clarification of
patient surgical risk.