Immunoglobulin G (IgG)*

At IntroLab laboratory, we perform the Immunoglobulin G (IgG) analysis—a diagnostic test applied to individuals with signs and symptoms indicating decreased or increased levels of Immunoglobulin G, particularly in patients with multiple myeloma. The Immunoglobulin G (IgG) analysis allows for the assessment of IgG antibody levels in the blood. IgG is the most abundant class of immunoglobulins in the blood and plays a crucial role in the body’s immune response. This type of immunological blood analysis can provide important information about the state of the immune system, as well as identify disorders or abnormalities.

In which cases is the Immunoglobulin G (IgG) analysis indicated?

Testing the levels of Immunoglobulin G (IgG) plays a significant role in assessing a person’s immune system. Determining elevated or decreased levels of this class of immunoglobulins is fundamental in diagnosing and monitoring various diseases and conditions.

The most common indications for blood analysis include:

• Immunodeficiencies: Determining IgG in the blood is often applied to individuals with recurrent respiratory and digestive system infections, which may indicate immunodeficiency disorders.
• Chronic infections and inflammatory conditions: Testing IgG can be useful in evaluating conditions involving chronic infections and chronic inflammatory states, providing information about the body’s immune response.
• Central nervous system (CNS) disorders: Measuring IgG levels may be beneficial in conditions such as meningitis, encephalitis, and multiple sclerosis, where local production of IgG in the CNS can be detected.

Interpreting the results

Decreased IgG levels may indicate:

• Primary immunodeficiency syndrome: For example, selective IgG deficiency, where IgG antibody levels are below normal values, which may predispose a person to frequent infections.
• Secondary immunodeficiency: For example, in patients undergoing hemodialysis or with chronic liver disease, low IgG levels may be present due to damage to the immune system caused by these conditions.

Increased IgG levels may indicate:

• Chronic infections: For example, elevated IgG levels may result from chronic bacterial or viral infections such as HIV infection or hepatitis.
• Autoimmune diseases: For example, in patients with systemic lupus erythematosus, rheumatoid arthritis, or Sjögren’s syndrome, elevated IgG antibody levels may be part of the immune response to autoimmune processes.

These are just some examples, and it is important to note that interpreting IgG analysis results should be done considering the overall clinical picture and other relevant factors. Only a professional medical team can accurately diagnose and interpret the results based on individual cases.