This book presents paraproteinemia and the highly complex scientific information behind it to clinicians in a way they can understand and, ultimately, apply to their diagnostic and treatment practices. Paraproteinemia or dysproteinemia is characterized by the overproduction of an immunoglobulin by clonal expansion of cells from the B cells lineage which includes the plasma cells. The resultant monoclonal protein can be composed of the entire immunoglobulin or of its components. The identification and categorization of the different representatives of this group of disorders have traveled a long distance, but despite its high prevalence there is surprisingly limited evidence, in some areas, to guide the best clinical practice both at the time of diagnosis and during follow up. This book seeks to fill that gap. The book is divided into three sections, introductory chapters, disease entities and experimental therapies. The text guides clinicians through these diseases and disorders.