Fig. 1.

Serum IgG concentrations in a 34-year-old man who has X-linked agammaglobulinemia. (Left panel) The diamonds and blue line indicate serum IgG concentrations at various times after a single intravenous infusion of 30 g (406 mg/kg). The black line indicates the average daily IgG level calculated by interpolation from points indicated by diamonds. Mean ± SEM = 850.6 ± 43 mg/dL. (Right panel) Serum IgG concentrations in the same patient receiving 12 g 16% IgG every 7 days. Mean ± SEM = 816 ± 16 mg/dL. (From Berger M. Subcutaneous immunoglobulin replacement in primary immunodeficiencies. Clin Immunol 2004;112:1–7; with permission.)