This book is the fourth edition of a highly regarded text which was first published in 1988. It introduces the reader to the interpretation of routine laboratory biochemical test results and covers all aspects of interpretative chemical pathology (including reproductive endocrinology, which was not covered previously).The approach is based on case material from the authors' laboratory and employs algorithms and similar aids for interpretation. The material is structured so that it is comprehensible to beginners as well as being useful for the more experienced practitioners. The envisaged audience is medical undergraduates, general practitioners, clinical biochemists and laboratory technicians.