There has been significant expansion and development in clinical laboratory sciences and, in particular, metrological concepts, definitions and terms since the previous edition of this book was published in 1995. It is of prime importance to standardize laboratory reports for reliable exchange of patient examination data without loss of meaning or accuracy. New disciplines have appeared and the interrelationships between different disciplines within clinical laboratory sciences demand a common structure and language for data exchange, in the laboratory and with the clinicians, necessitating additional coverage in this book. These new sections will be based upon recommendations published by various national, regional, and international bodies especially IUPAC and IFCC. This book groups and updates the recommendations and will be appropriate for laboratory scientists, medical professionals and students in this area.