Third edition. Edited by Drew Provan This book provides a patient-oriented approach to investigation. The first chapter describes key symptoms and signs along with tests that may be of value in reaching a diagnosis. The remainder of the book is specialty-centred and provides a comprehensive review of all available tests within a given subject. The aim is of the book is to provide a more rational method of investigation and prevent over-investigation which is expensive for the hospital and unpleasant for the patient.