Laboratory tests are an individual aid to the practicing oral and maxillofacial surgeon. In conjugation with a other history and physical examination, the myriad of laboratory tests available can aid in the diagnosis of various disease and allow the precise preoperative and postoperative management of patient with systemic disease. In addition, patients without overt disease can be screened before procedures that carry potentially serious complications are begun, such as general anaesthesia. This book will help to understand and perform various laboratory investigations in a proper way and thus helping you to frame a better diagnosis.