This book is a review of the basic tests available in gastroenterology. Emphasis is placed on these techniques of which the authors have personal experiece. The philosophy has been to evaluate investigations for their current clinical usefulness in the management of patients. A critical analysis has been made to describe those older tests which have proved their worth alongside the newer procedures which have been introduced. Just as some recent additions have rapidly gained importance, some familiar tests have lost significance because of medical progress. Testing for Helicobacter pylori has...