Hormone measurement is necessary for the diagnosis of a wide range of clinical conditions and is essential for monitoring the effectiveness of treatment. As the number of hormone requests in the clinical field rises exponentially, it has become imperative to create hormone assays accessible to researchers with a varied range of equipment. Hormone Assays in Biological Fluids, Second Edition reviews common techniques used to measure hormones as well as relatively new methods such as tandem mass spectrometry. Additionally, subsequent chapters detail methods for a broad range of hormones; Techniques and principles covered are transferable to a wide range of substances across species. Written in the successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible protocols, and notes on troubleshooting and avoiding known pitfalls.