Immunoglobulin G (IgG) Subclass 2 Quantification (Serum/Plasma)

What Does IgG2 Serve in Your Body?

IgG2 antibodies are a specific subgroup of Immunoglobulin G (IgG) that play a key role in defending against certain types of bacteria and some viruses. They help neutralize toxins produced by these pathogens and mark them for destruction by other immune cells. IgG2 is particularly important in the immune response against encapsulated bacteria, such as some strains of Streptococcus and Haemophilus.

Why Might Your IgG2 Levels Be Tested?

Doctors may order an IgG2 test if you have symptoms or conditions linked to immune system issues, such as recurrent infections, autoimmune diseases, or if you’re being evaluated for immune deficiencies. It can also be part of a broader immune function assessment, especially in children or adults with suspected immune disorders.

How Is This Test Performed?

A blood sample is taken from a vein in your arm. The blood is then processed to separate the serum or plasma, where the IgG2 antibodies are measured using a specialized immunoassay technique. This test does not require fasting and is typically done as part of a routine blood draw.

What Are Possible Results and Next Steps?

Results may be compared to reference ranges provided by your healthcare provider, though these can vary by lab. Low IgG2 levels might suggest an immune deficiency or other underlying health concerns, while higher levels may not necessarily indicate a problem unless related to a known condition. Your doctor will discuss results and next steps based on your medical history and symptoms.