It is ordered to determine the amount of immunoglobulin G in the blood stream. Although Igg is the most occurring immunoglobulin in the blood, the results can reveal the presence of infection and your level of immunity.
1 IgG antibodies are the only type of antibody that can cross the placenta in a pregnant woman to help protect her baby (fetus). 2  IgM. 3  IgM antibodies are the largest antibody. 4  They are found in blood and lymph fluid and are the first type of antibody made in response to an infection. 1 IgM. 2  IgM antibodies are the largest antibody. 3  They are found in blood and lymph fluid and are the first type of antibody made in response to an infection. 4  They also cause other immune system cells to destroy foreign substances. 5  IgM antibodies are about 5% to 10% of all the antibodies in the body. 6  IgE. About immunoglobulin G. Immunoglobulin G, also known as IgG, is the most common type. It makes up as much as 80 percent of all the antibodies in the blood. IgG is broken into four different subclasses, IgG1 through IgG4. IgG is always available to help ward off infections. A blood test that measures immunoglobulin can show abnormally low levels of the antibodies and diagnose IgG deficiency. It's possible to have a normal level of total IgG, so the testing of the IgG subclasses is important. Guide. An immunoglobulins test is done to measure the level of immunoglobulins, also known as antibodies, in your blood. Antibodies are substances made by the body's immune system in response to bacteria, viruses, fungus, animal dander, or cancer cells. 1 IgM. 2  IgM antibodies are the largest antibody. 3  They are found in blood and lymph fluid and are the first type of antibody made in response to an infection. 4  They also cause other immune system cells to destroy foreign substances. 5  IgM antibodies are about 5% to 10% of all the antibodies in the body. 6  IgE. Functions [edit]. Antibodies are major components of humoral immunity. IgG is the main type of antibody found in blood and extracellular fluid allowing it to control infection of body tissues. By binding many kinds of pathogens such as viruses, bacteria, and fungi, IgG protects the body from infection. IgG antibodies are generated following class switching and maturation of the antibody response and thus participate predominantly in the secondary immune response. IgG is secreted as a monomer that is small in size allowing it to easily perfuse tissues. 1 IgM antibodies are the largest antibody. 2  They are found in blood and lymph fluid and are the first type of antibody made in response to an infection. 3  They also cause other immune system cells to destroy foreign substances. 4  IgM antibodies are about 5% to 10% of all the antibodies in the body. 1 IgM. 2  IgM antibodies are the largest antibody. 3  They are found in blood and lymph fluid and are the first type of antibody made in response to an infection. 4  They also cause other immune system cells to destroy foreign substances. 5  IgM antibodies are about 5% to 10% of all the antibodies in the body. 6  IgE. The IgG blood test is ordered to determine the amount of immunoglobulin G in the blood stream. Although IgG is the most occurring immunoglobulin in the blood, the results can reveal the presence of infection and your level of immunity. slide 1 of 5. This is a simple blood test used to determine the amount of immunoglobulin G, an important part of the body’s immune system. This particular immunoglobulin is the most prevalent in the body and helps protect from bacteria and other pathogens that may cause illness by creating an antigen to fight off such pathogens. However, there are limitations to the IgG blood results. This test alone can not be utilized to diagnose a specific disease. In most cases, the IgG is ordered in combination with the IgA and IgM, along with other tests when the physician suspects a certain illness or condition. A test for quantitative immunoglobulins (Igs) is used to detect an excess or deficiency in the three major classes of immunoglobulins (IgG, IgA, and IgM). The results of the tests for IgG, IgA, and IgM levels are usually evaluated together. Abnormal test results typically indicate that there is something affecting the immune system and suggest the need for further testing. Why It Is Done. A test for immunoglobulins (antibodies) in the blood is done to: 1  Find certain autoimmune diseases or allergies. 2  Find certain types of cancer (such as multiple myeloma or macroglobulinemia). 3  See whether recurring infections are caused by a low level of immunoglobulins (especially IgG)
http://www.webmd.com/a-to-z-guides/immunoglobulins http://www.hopkinsmedicine.org/healthlibrary/conditions/allergy_and_asthma/igg_deficiencies_134,109/ http://www.webmd.com/a-to-z-guides/immunoglobulins https://en.wikipedia.org/wiki/Immunoglobulin_G http://www.webmd.com/a-to-z-guides/immunoglobulins http://www.brighthub.com/science/medical/articles/95787.aspx https://labtestsonline.org/understanding/analytes/immunoglobulins/tab/test http://www.webmd.com/a-to-z-guides/immunoglobulins?page=2
what is an igg blood test