Abstract
Preoperative laboratory tests play an important role in preoperative assessment. The primary goals of preoperative tests are to assess the severity of the pathological condition suggested by the past history and physical examination, and to make plans for perioperative management including anesthesia. The results of laboratory tests should be evaluated in the light of the sensitivity and specificity of the test and the incidence of the pathological condition in the population to which the patient belongs. False positive tests will result in an unnecessary psychological, physical, and economical burden to the patient. False negative tests will lead to a false sense of security and result in an unfavorable outcome. So-called routine tests such as chest radiographs, electrocardiogram, and hemoglobin determination are not effective screening tools, and may not be warranted for asymptomatic patients undergoing minor surgery.
