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- W2091876302 abstract "Objective: To determine the frequency of tests done in the year before elective surgery that might substitute for preoperative screening tests and to determine the frequency of test results that change from a normal value to a value likely to alter perioperative management. Design: Retrospective cohort analysis of computerized laboratory data (complete blood count, sodium, potassium, and creatinine levels, prothrombin time, and partial thromboplastin time). Setting: Urban tertiary care Veterans Affairs Hospital. Patients: Consecutive sample of 1109 patients who had elective surgery in 1988. Measurements and Main Results: At admission, 7549 preoperative tests were done, 47% of which duplicated tests performed in the previous year. Of 3096 previous results that were normal as defined by hospital reference range and done closest to the time of but before admission (median interval, 2 months), 13 (0.4%; 95% CI, 0.2% to 0.7%), repeat values were outside a range considered acceptable for surgery. Most of the abnormalities were predictable from the patient's history, and most were not noted in the medical record. Of 461 previous tests that were abnormal, 78 (17%; CI, 13% to 20%) repeat values at admission were outside a range considered acceptable for surgery (P < 0.001, frequency of clinically important abnormalities of patients with normal previous results with those with abnormal previous results). Conclusions: Physicians evaluating patients preoperatively could safely substitute the previous test results analyzed in this study for preoperative screening tests if the previous tests are normal and no obvious indication for retesting is present." @default.
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- W2091876302 date "1990-12-15" @default.
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- W2091876302 title "Preoperative Screening: Value of Previous Tests" @default.
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- W2091876302 doi "https://doi.org/10.7326/0003-4819-113-12-969" @default.
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