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[Preoperative clinical evaluation].

The purpose of preoperative evaluation is to reduce the morbidity and mortality of surgical interventions. The operative risk is related to: the nosocomial environment, the anesthetic procedure, the surgical team, the magnitude of the intervention and the patient's psychological, physical and pathological conditions. An adequate history and physical examination are essential to evaluate the patient's clinical situation. In our country, an electrocardiogram (EKG) with an estimation of the "surgical risk" and a number of laboratory tests are usually done. This article discusses the evidence and recommendations on the usefulness and indications of the EKG, the laboratory test, the coagulation tests and the chest X-ray. The decision to order preoperative tests should be based on positive clinical findings, the need to obtain basal values before major interventions and the existence of risk factors for certain diseases. The ambulatory preoperative clinical evaluation is the best method for the detection of diseases that could modify the surgical risk. It is also the opportunity to consult specialists if needed and to indicate necessary prophylactic measures.