Book excerpt: Clinical Biochemistry is about patients - how we investigate their signs and symptoms, how we diagnose their illnesses and how we treat them. In this book the authors present a series of clinical cases, all based on real patients, and invite the reader to answer key questions using their knowledge and experience of each topic. Each case and its questions are accompanied by the authors' detailed answers, which can be found by simply turning the page. As such, it is an ideal revision aid for those studying Medicine, Nursing and Biomedical Sciences and for those preparing for post-graduate membership examinations.