Abstract

Methods: We retrospectively evaluated laboratory and bleeding histories in 39,884 patients aged greater than 1 year and lesser than 19 years who had undergone elective surgery from January 2003 to March 2015. All of the patients had preoperative coagulation screening with complete blood count, prothrombin time (PT) and activated partial thromboplastin time (aPTT). If PT and/or aPTT were abnormal, further studies, such as mixing test, coagulation factor assay, anti-phospholipid antibody studies were done.

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