Book excerpt: Principles and Practice of Bioanalysis provides a guide to the methods available and the techniques currently used in this field. It provides up to the minute information and guidance on the methods and strategy used in developing and running ultra-trace analyses for drugs, metabolites and other substances. The authors writes in an informal and didactic style, offering a logical path through the problems of small molecule (bio)analysis and enables readers to choose appropriate methods of analysis for their needs. Principles and Practice of Bioanalysis provides an overview of analytical methods for analytical scientists within the pharmaceutical industry, research and development, the agrochemical industry, and scientists in the health service, biology and biochemistry. It also gives postgraduate students a useful reference for their research methods.