Application segmentation clarifies clinical demand across specific immunodeficiency disorders. Key applications include common variable immunodeficiency (CVID), X-linked agammaglobulinemia (XLA), and severe combined immunodeficiency (SCID). CVID accounts for the largest share, driven by its high prevalence and lifelong IVIG/SCIG dependency. XLA, though rare, relies heavily on immunoglobulin replacements due to absent B-cell function. SCID, a pediatric-focused application, is increasingly addressed by gene therapies alongside traditional immunoglobulin treatments. Emerging applications in autoimmune complications of immunodeficiency, such as myasthenia gravis, are expanding the marketโs scope. This market taxonomy reveals how clinical unmet needs and treatment modalities shape revenue distribution, with CVID alone capturing ~45% of application-driven demand.