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Research Immunoglobulin A, Qn, Serum
Immune System

Immunoglobulin A, Qn, Serum

Other names: Total IgA (mg/dL)

Optimal Result: 87 - 352 mg/dL, or 0.87 - 3.52 g/L.

Immunoglobulin A (IgA), one of the five primary immunoglobulins, plays a pivotal role in mucosal homeostasis in the gastrointestinal, respiratory, and genitourinary tracts, functioning as the dominant antibody of immunity in this role.

Total IgA (Immunoglobulin A), expressed in milligrams per deciliter (mg/dL), is a crucial marker in clinical immunology representing the predominant immunoglobulin class in mucosal secretions and the second most abundant immunoglobulin in serum. This glycoprotein plays a pivotal role in mucosal immunity, offering a primary line of defense against pathogens at mucosal surfaces, including the gastrointestinal, respiratory, and genitourinary tracts. Normal levels of Total IgA in the blood vary based on age and individual health conditions but typically range from 70 to 400 mg/dL in adults.

Elevated levels of Total IgA can be indicative of chronic infections, liver diseases, certain autoimmune conditions like celiac disease, or IgA monoclonal gammopathy, including IgA myeloma.

Conversely, low levels might suggest IgA deficiency, which is the most common primary immunodeficiency, potentially leading to an increased susceptibility to infections, particularly of the respiratory and gastrointestinal tracts.

Monitoring Total IgA levels is thus critical for diagnosing and managing various immunological disorders, assessing immune system health, and providing insights into the body's mucosal immune response. Additionally, changes in Total IgA levels can be instrumental in guiding therapeutic decisions and evaluating the efficacy of treatments in conditions where mucosal or systemic immunity is compromised.

What is an immunoglobulin?

Immunoglobulins, also known as antibodies, are glycoprotein molecules produced by plasma cells (white blood cells). They act as a critical part of the immune response by specifically recognizing and binding to particular antigens, such as bacteria or viruses, and aiding in their destruction. The antibody immune response is highly complex and exceedingly specific. The various immunoglobulin classes and subclasses (isotypes) differ in their biological features, structure, target specificity, and distribution.

Immunoglobulin A (IgA) is the second most abundant immunoglobulin type found in the body and, consequently, has a crucial role in protection against antigens.

IgA production is greater than all other immunoglobulin subtypes, necessary for the many roles it plays systemically. 

IgA protects against infections of the mucous membranes lining the mouth, airways, and diggestive tract. Found in mucosal areas, such as the gut, respiratory tract and urogenital tract, and prevents colonization by pathogens. Also found in saliva, tears, and breast milk.

- IgA deficiency is a genetic health problem that can be passed down through families.

- Most people with an IgA deficiency don’t have any symptoms.

- There is no cure for IgA deficiency. Immunotherapy does not work to treat it.

- Complications for IgA deficiency include asthma, diarrhea, ear and eye infections, autoimmune diseases, and pneumonia.

What does it mean if your Immunoglobulin A, Qn, Serum result is too high?

Elevated IgA levels are nonspecific, but can be seen in pulmonary and gastrointestinal inflammatory diseases, some autoimmune conditions, liver disease, and plasma cell disorders.

IgA antibodies are found in the mucous membranes of the lungs, sinuses, stomach, and intestines. They're also in fluids these membranes produce, like saliva and tears, as well as in the blood.

Some possible causes of high levels of one or more immunoglobulins are:

- An autoimmune disease
- Hepatitis
- Cirrhosis
- Chronic infection/inflammation
- IBD
- Diabetes and diabetic complications
- Obesity / Metabolic syndrome
- Alcoholism
- IgA nephropathy or Berger's disease
- Rheumatoid arthritis with high titres of rheumatoid factor
- SLE (occurs in some patients)
- Sarcoidosis (occurs in some patients)
- Wiskott-Aldrich syndrome

High levels can be due to certain cancers. These cancers often cause a very high level of one type of immunoglobulin and low levels for the other types:

- Multiple myeloma
- Chronic lymphocytic leukemia (CLL)
- Lymphoma
- Waldenstrom macroglobulinemia

If your immunoglobulin levels are not normal, it does not always mean you have a condition that needs treatment. Certain medicines can affect your results. If you have questions about your results, talk with your healthcare provider.

What does it mean if your Immunoglobulin A, Qn, Serum result is too low?

Immunoglobulin A (IgA) is an antibody blood protein that’s part of your immune system. Your body makes IgA and other type of antibodies to help fight off sickness. Having an IgA deficiency means that you have low levels of or no IgA in your blood. 

IgA is found in mucous membranes, mainly in the respiratory and digestive tracts. It is also found saliva, tears, and breastmilk. A deficiency seems to play a part in asthma and allergies. Researchers have also linked IgA deficiency to autoimmune health problems. These are health problems that cause your body’s immune system to attack your body by mistake.

Some people are born with low or absent levels of IgA. Low levels occur in some types of leukemia, kidney damage (nephrotic syndrome), a problem with the intestines (enteropathy), and a rare inherited disease that affects muscle coordination (ataxia-telangiectasia). This increases the chances of developing an autoimmune disease. Patients with low IgA are at some increased risk of developing severe reactions after receiving blood products.

Possible symptoms:

Most people with an IgA deficiency do not have any symptoms. About 1 in 4 to 1 in 2 people with selective IgA deficiency will be affected. Some people with an IgA deficiency are more likely to get frequent infections. These can include sinus, lung, and digestive infections. Some people with IgA deficiency also are more likely to have allergies, and digestive and autoimmune problems such as celiac disease or lupus.

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