Immunoglobulin replacement therapy has been used for treating various infections over the past 50 years. It has been traditionally administered intravenously, but now subcutaneous delivery of immunoglobulin is proving to be an attractive alternative. What disorders are immunoglobulin therapy used to treat, and what are the advantages to each type of preparation? Dr. Stanley Fineman, clinical associate professor in the department of pediatrics at Emory University School of Medicine, discusses novel approaches to immunoglobulin therapy with host Dr. Todd Mahr. Which patients are the best candidates for immunoglobulin therapy?