What does a low IgG and IgG subclasses mean?

Low IgG levels and low IgG subclasses can indicate an underlying immunodeficiency, as these antibodies play a crucial role in the immune response to infections. This condition may lead to increased susceptibility to bacterial infections and may be associated with various genetic disorders or acquired conditions. Additionally, low IgG levels can result from chronic diseases, certain medications, or malnutrition. A thorough evaluation by a healthcare professional is essential to determine the underlying cause and appropriate management.