Table 1.

Laboratory test results

Blood test	Result	Age-corrected reference values
Immunoglobulins
IgA (g/L)	1.9	0.5–2.2
IgG (g/L)	9.2	5.4–13.6
IgM (g/L)	1.6	0.5–1.9
IgG subclasses
IgG1 (g/L)	6.9	4.0–11.5
IgG2 (g/L)	2.3	0.98–4.8
IgG3 (g/L)	0.52	0.15–1.49
IgG4 (g/L)	1.60	0.03–2.10
Lymphocyte subpopulation*
B cells (×109/L)	0.4	0.3–0.7
T cells (×10 9/L)	1.9	1.1–2.8
CD4 T cells (×109/L)	1.2	0.5–1.8
CD8 T cells (×109/L)	0.6	0.4–1.2
NK cells (×109/L)	0.2	0.1–0.6
Complement system
AP50† (%)	123	67–128
CH50‡ (%)	128	68–133
Complement factor C3 (mg/dL)	134	80–150
Complement factor C4 (mg/dL)	24	13–37
Complement factor C1q (IE/L)	126	81–128
Vaccination response titres
Antidiphteria toxoid antibodies (IU/L)	0.26	>0.1 IU/mL: normal response to protein antigens
Antitetanus toxoid antibodies (IU/L)	1.57	>0.1 IU/mL: normal response to protein antigens

*Reference value from ref. 25.

†Complement alternative pathway (AP50) activity: screening assay for the activation of the alternative complement pathway.

‡Total haemolytic complement (CH50) activity: screening assay for the activation of the classical complement pathway.

Ig, immunoglobulin; NK, natural killer.