Her laboratory results showed hypogammaglobulinemia (IgM = 0.0.14 g/L normal: 0.4–2.6, IgG = 4.1 g/L normal: 6.5–18, IgA = 0.05 g/L normal: 0.7–3.6). This evidence concerns the gene CD40LG and agammaglobulinemia.