Immunoassay for Immunoglobulin G (IgG) Subclass 1 (IgG1) in Serum/Plasma

What Does This Test Measure?

IgG1 is one of four subclasses of Immunoglobulin G (IgG), the most common antibody in your blood. This subclass is particularly important for responding to certain bacteria and viruses. Your body produces different IgG subclasses in varying amounts depending on the type of immune response needed. Measuring IgG1 can help doctors assess how well your immune system is functioning in specific ways.

Why Might This Test Be Ordered?

Doctors may order this test if you have symptoms or conditions that suggest an immune system issue, such as recurrent infections, autoimmune diseases, or certain types of immune deficiencies. It may also be used to monitor treatment responses in patients with conditions like chronic infections or immune-related disorders.

Common Reasons for Testing

Common reasons include evaluating immune function, diagnosing or monitoring conditions like chronic infections (e.g., HIV), autoimmune diseases (e.g., lupus), or immune deficiencies. It may also be used in research or specialized clinical settings to study antibody responses.

Sample Collection and Preparation

A blood sample is typically collected from a vein in your arm. The blood is processed to separate the serum or plasma, which is then sent to a lab for testing. No special preparation is usually needed, but you may be asked to avoid certain medications or foods for a short time before the test if instructed by your healthcare provider.