Subcutaneous Immunoglobulin (SCIG) is a treatment that involves administering antibodies directly under the skin. It is primarily used for patients with immune deficiencies, helping to boost their immune system by providing the necessary antibodies that their bodies may not produce adequately. This method allows for a more gradual absorption of immunoglobulins compared to intravenous methods. SCIG is typically given through a small needle inserted into the fatty tissue, making it a convenient option for home treatment. Patients can self-administer the therapy, which can improve their quality of life by reducing the frequency of hospital visits while maintaining effective immune support.