This is the definitive work on human Laboratory Andrology. Not only does Dr. Mortimer give detailed protocols for performing laboratory testing of male fertility, but he also provides the scientific background for each test and clinical significance of the results. In addition, he discusses quality control and laboratory management issues. Each section is clearly written with straightforward explanations. There are excellent illustrations throughout. As a practicing Andrologist, who directs an Andrology Laboratory, I can not imagine getting by without this reference. I highly recommend this text to anyone who performs semen analysis. The text would also be of interest to sperm biologist working with domestic, exotic and research species.