A multifaceted approach to the detection and characterization of infections encountered in this high-risk patient group. Examines a wide range of approaches and challenges to infectious disease diagnostics for immunocompromised patients. Provides a broad explanation of the causes of immune suppression, the populations at risk for infections, and the various kinds of infections. Addresses crucial laboratory diagnostic methods for individual pathogens. Details a more systematic perspective on the affected organs in immunocompromised patients. Serves as a reference for laboratory professionals, infectious disease physicians, oncologists, transplant specialists, and other healthcare providers who care for immunocompromised patients.