Test Background Isolated IgG1 deficiency is almost always seen in association with reduced serum IgG levels. Patients with IgG2 deficiency who fail to make appropriate antibody responses to pneumococcus and other polysaccharide encapsulated micro-organisms have an increased risk of bacterial infection. There is no evidence that isolated IgG3 deficiency is associated with disease and up to 25 % of Caucasians have reduced or absent IgG4 levels.
Clinical Indications Presentation of progressive and recurrent respiratory infection, multiple recurrent otitis media, severe pyogenic infection and ataxia telangiectasia.
Reference Range Adults
IgG 1: 3.2-10.2 g/L
IgG 2: 1.2-6.6 g/L
IgG 3: 0.2-1.9 g/L
IgG 4: 0-1.3 g/L
Please note, values for children vary according to age.