Book excerpt: The second edition of Essential Guide to Blood Groups is a pocket-sized book containing four-color text together with schematic figures and tables. The book comprises an introduction to blood groups, followed by chapters on techniques, information on various blood groups, antibodies, quality assurance in immunohaematology, and it concludes with chapters on troubleshooting in the laboratory, and FAQs. It also covers the serology, inheritance, biochemistry and molecular genetics of the most important blood group systems.