This fourth, updated edition contains the latest developments in preanalytical knowledge. An international team of authors summarizes the information on biological influences, analytical interferences and on the variables affecting the collection, transport and storage, as well as preparation of samples. In so doing, they cover age, gender, race, pregnancy, diet, exercise and altitude, plus the effects of stimulants and drugs. National and international standards are described for sampling procedures, transport, sample identification and all safety aspects, while quality assurance procedures are shown for total laboratory management. In addition, this practical book is rounded off by a glossary explaining all terms being used. This book is a must-have for everyone involved in patient care and using or performing laboratory tests.