Novel BTK Mutation in Patient with Late Diagnosis of X-Linked Agammaglobulinemia

Table 1

Immunoglobulin levels were drawn and revealed baseline agammaglobulinemia while on immunoglobulin replacement therapy, as well as a lack of serum CD19+ B cells.

	Immunoglobulin levels	Reference range
IgA	7	70–400 mg/dL
IgM	<10	40–230 mg/dL
IgG	644	700–1,600 mg/dL
	Lymphocyte markers	Reference range
CD3	0.581	0.71–4.18
CD4	0.154	0.35–2.75
CD4/CD8	0.38	1–3.5
CD19	Absent	—