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What Is Igg Blood Test

Why Do You Need Immunoglobulin G Test

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There are several reasons that necessitate the use of the IgG test like

  • It helps in ascertaining whether the individual has been exposed to illness or not.
  • It helps in determining the immunity level post recovery from an illness or post vaccination.
  • This test is also helpful in chronic inflammation cases
  • In recurring infection cases
  • If the infection caused is assumed to be due to IgG antibodies.

Why You Might Need This Test

Your doctor might order an immunoglobulin test if you get a lot of infections — especially infections of the sinuses, lungs, stomach, or intestines.

They may also order the test if you have:

  • Diarrhea that doesn’t go away
  • Unexplained weight loss
  • Sickness after traveling
  • HIV/AIDS or multiple myeloma , or another condition that needs to be monitored

Immunologic Conditions With Reduced Igg Levels

Hypogammaglobulinemia in infants younger than 2 years may suggest transient hypogammaglobulinemia of infancy. Laboratory findings include IgG levels less than 2 SDs below the mean for age, normal B-lymphocyte numbers, and normal or near normal IgG antibody responses to vaccines. Most infants with transient hypogammaglobulinemia of infancy achieve normal levels of serum IgG by the age of 2 years however, few continue to have low levels of IgG until 5 or 6 years of age.2

The diagnosis of X-linked agammaglobulinemia or the rarer autosomal recessive form of agammaglobulinemia is usually made in the first few years of life due to family history or recurrent sinopulmonary infections. Laboratory findings include profound hypogammaglobulinemia and extremely low to absent circulating B cells. Serum IgG levels are usually less than 200 mg/dL, and IgM and IgA levels are less than 20 mg/dL. Peripheral blood CD19+ B-cell counts are commonly less than 0.1%.1,79

Patients with one of the hyper-IgM syndromes, X-linked or autosomal recessive, have a deficiency of IgG and IgA. Laboratory studies show low levels of serum IgG and IgA with normal or elevated levels of IgM, decreased IgG antibody responses, and variable T-cell defects.10

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How Do You Test For Mumps

Check inside the mouth to see the position of the tonsils when infected with mumps, a persons tonsils can get pushed to the side. Take the patients temperature. Take a sample of blood, urine, or saliva to confirm diagnosis. Take a sample of CSF from the spine for testing this is usually only in severe cases.

What is the prognosis for mumps?

Mumps is caused by a virus, so antibiotics arent effective. But most children and adults recover from an uncomplicated case of mumps within a few weeks. People with mumps are generally no longer contagious and can safely return to work or school about five days after the appearance of signs and symptoms. Rest is the best treatment.

Why Do I Need An Immunoglobulins Blood Test

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You may need this test if you have symptoms that could mean your immunoglobulin levels are too low. If you have too few immunoglobulins, you have an immunodeficiency.

Symptoms of low levels of immunoglobulins usually include having many, repeated infections and other problems, such as:

  • Sinus, throat, and ear infections
  • Respiratory infections, such as pneumonia and bronchitis
  • Serious infections from germs that don’t usually cause problems in healthy people, such as:
  • Cytomegalovirus
  • A yeast infection in the mouth, eyes, or digestive tract

You may need an immunoglobulins test if immunodeficiency runs in your family, or your health care provider thinks you may have a problem making normal levels of immunoglobulins.

You may also need this test if your provider thinks you may have high levels of immunoglobulins from an autoimmune disease or a cancer that affects your blood, bone marrow, and/or immune system. These cancers may cause a very high level of certain immunoglobulins. But those immunoglobulins don’t work normally. So, even though your levels are high, you may have frequent infections and other symptoms of low immunoglobulin levels.

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Whats A Food Intolerance Blood Test Actually Testing

Hemocode is an IgG blood test, according to the manufacturer :

The Hemocode System is a finger prick test that identifies specific immune system-based food intolerances.

Everything we eat can elicit a positive or negative reaction in the body. If you are intolerant to a certain food and you continue to eat it, your body will mount an inflammatory reaction which may manifest in a variety of lifestyle-affecting conditions such as headaches, chronic pain, digestive disorders and many other issues

The Hemocode food intolerance test is a statistically proven, doctor and pharmacist recommended IgG-related test that determines which foods are causing negative reactions.

The YorkTest is also an IgG test. There is no published information in the literature that describes either the Hemocode or the Yorktest, or their analytic validity for any of the products tested for.

What Is A Blood Test

A blood test is when a blood sample is tested in a lab. Doctors order blood tests to check things such as the levels of glucose, hemoglobin, or white blood cells. This can help them find problems like a disease or medical condition. Sometimes, blood tests can help them see how well an organ is working.

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Are There Symptoms Associated With Decreased Immunoglobulins

Not specific ones. Unexplained recurrent infections, multiple infections, or opportunistic infections, with or without chronic diarrhea, may indicate a need to check a persons immune status. A positive family history of an immunodeficiency may also require follow up. A thorough physical examination and a careful medical history can be critical to a diagnosis.

What Is Immunoglobulin G Test / What Is Igg Test

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The Immunoglobulin G test also known by several names like IgG Serum, Quantitative IgG, IgG Test and Serum. It is a simple blood test that measures the level of Immunoglobulin G antibodies in the blood. The IgG Serum test is performed to determine the presence of any infection in the body and the level of immunity of our body.

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Is There Something I Can Do To Alter My Immunoglobulin Levels

In most cases, immunoglobulins do not respond to lifestyle changes. If you are taking a drug that is decreasing one or more of your immunoglobulins, then you and your healthcare practitioner may decide to alter your medications. It is very important, however, NOT to discontinue or change your medication dosage without consulting with your healthcare provider.

Infants gradually lose protection from infections as the levels of IgG they receive through the placenta from their mothers decrease after birth. Greater protection can be provided for babies through breastfeeding since breast milk contains IgA, which protects against infections.

How Should We Prepare For An Immunoglobulin Test

Kids can eat and drink normally unless also getting other tests that require fasting beforehand. Tell your doctor about any medicines your child takes because some drugs might affect the test results.

Wearing a T-shirt or short-sleeved shirt for the test can make things easier for your child, and you also can bring along a toy or book as a distraction.

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My Newborn Had An Immunoglobulin Test Why

Sometimes an IgM test is used to determine whether a newborn acquired an infection before birth . IgM may be produced by a developing baby in response to infection. Due to the size of IgM antibodies, they cannot pass through the placenta from mother to baby during pregnancy. Thus, any IgM antibodies present in a newborns blood are not from the mother but were produced by the baby. This indicates that an infection began during pregnancy.

Immunoglobulin G Blood Test

Coronavirus Blood Test (COVID

Also Known As: Total IgG IgG IgG Serum Quantitative IgG, Serum


No special preparation is required.

Test Results:

2-3 days. May take longer based on weather, holiday or lab delays.

Also Known As: Total IgG IgG IgG Serum Quantitative IgG, Serum


No special preparation is required.

Test Results:

3-5 days. May take longer based on weather, holiday or lab delays.

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Immunoglobulin G Normal Range

The immunoglobulin G normal range varies with age and here are the IgG normal range for different age groups

  • The IgG normal range for age 0-1 years is between 231-1411 mg/dL
  • The IgG normal range for age 1-3 years is between 453-916 mg/dL
  • The Immunoglobulin normal range for age 4-6 years is between 504-1464 mg/dL
  • The Immunoglobulin normal range for age 7-9 years is between 572-1474 mg/dL
  • The IgG normal range for age 10-11 years: is between 698-1560 mg/dL
  • The IgG normal range for age 12-13 years is between 759-1549 mg/dL
  • The IgG normal range for age 14-15 years is between 716-1711 mg/dL
  • The IgG normal range for age 16-19 years is between 549-1584 mg/dL
  • The IgG normal range for people older than 19 years of age is between 700-1600 mg/dL

Assessment And Clinical Interpretation Of Reduced Igg Values

Patients are often referred to immunologists for the evaluation of reduced serum IgG levels. Because antibody deficiencies are the most common of the primary immune defects, examination of humoral immunity in these patients is valuable.1,2 This article is the first in a series dealing with the diagnosis of immunodeficiency disorders, with focus on the interpretation of reduced IgG values. The information presented should be interpreted in the clinical context of each patient along with other evaluation measures, such as IgM and IgA levels and functional humoral immunity, discussed in subsequent articles.

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What Is Being Tested

Immunoglobulins play a key role in the bodys immune system. They are proteins produced by specific immune cells called plasma cells in response to bacteria, viruses, and other microorganisms as well as exposures to other substances that are recognized by the body as non-self harmful antigens. This test measures the amount of immunoglobulins A, G, and M in the blood and, in certain circumstances, in cerebrospinal fluid or saliva.

The first time a person is infected or otherwise exposed to a foreign substance , their immune system recognizes the microorganism or substance as non-self and stimulates plasma cells to produce specific immunoglobulin, also called antibodies, that can bind to and neutralize the threat. With subsequent exposures, the immune system remembers the antigen that was encountered, which allows for the rapid production of more antibodies and, in the case of microorganisms, helps prevent re-infection.

There are five classes of immunoglobulins and several subclasses. Each class represents a group of antibodies and has a slightly different role. Classes of immunoglobulins include:

Immunoglobulins testing measures the total amount of each primary immunoglobulin class, IgA, IgM, and IgG, without distinguishing between subclasses. Separate testing can be performed to measure immunoglobulin subclasses and/or to detect and measure specific antibodies.

How Accurate Is A Test For Igg4 Only

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There is a complex relationship between the four IgG subtypes. Meaningful results can only be determined by testing for all four subtypes together.

IgG1, IgG2 and IgG3 are all capable of causing inflammation which could contribute to symptoms. IgG4 antibodies are only present in low levels and its presence does not relate directly to inflammatory reactions.

Therefore, testing only for IgG4 antibodies in foods severely limits the accuracy of pinpointing those ingredients that are causing significant reactions and could be contributing to your symptoms.

The substantive YorkTest clinical evidence base for food-specific IgG guided elimination diet supports this approach and recognizes the fundamental importance of measuring IgG1-4 and not just IgG4 alone.

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What Does The Test Result Mean

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. Immunoglobulins testing is not diagnostic but can be a strong indicator of a disease or condition. There are a number of conditions that are associated with increased and decreased immunoglobulins.

High levelsIncreased polyclonal immunoglobulins may be seen with a variety of conditions.

Monoclonal immunoglobulins are seen in blood cell tumors that involve lymphocytes or plasma cells. In these disorders, there is typically a marked increase in one class of immunoglobulin and a decrease in the other two classes. Although affected people may have an increase in total immunoglobulins, they are actually immunocompromised because most of the immunoglobulins produced are abnormal and do not contribute to the immune response.

The following table lists some examples of conditions that may cause increased immunoglobulins:

Immunoglobulin Result
Polyclonal increase in any or all of the three classes
  • Infections, acute and chronic
  • Autoimmune disorders
  • In a newborn, infection during pregnancy
Monoclonal increase in one class with or without decrease in other two classes
  • Multiple myeloma
  • Waldenstroms macroglobulinemia

The table below lists some of the common causes of low levels:

Food And Environmental Antibody Assessment

The IgG and IgE Antibody Panels are blood tests that measure antibodies to commonly consumed foods and environmental allergens. The body can react to foods in many different ways. Adverse food reactions can lead to distressing symptoms and chronic health conditions. Often times it is unknown exactly which food may be the cause and testing can help identify the problematic foods. Removal of the reactive foods often results in resolution of symptoms.

What is the difference between IgE and IgG-mediated reactions?

The key differences between IgE allergies and IgG sensitivities are summarized below:

IgE-Mediated Allergies
  • Immediate onset
  • Circulating half-life of 1-2 days
  • Permanent allergies
  • Mast cell activation
  • Stimulates histamine release
  • Hives, stuffy or itchy nose, sneezing, itchy, teary eyes, vomiting, stomach cramps or diarrhea, angioedema or swelling, shortness of breath or wheezing, anaphylaxis
IgG-Mediated Sensitivities
  • Circulating half-life of 22-96 days
  • Temporary sensitivities
  • Activates complement and forms immune complexes
  • Does not stimulate histamine release
  • Gastrointestinal symptoms, headaches, joint aches, skin rashes, fatigue, behavioral problems, other vague symptoms

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Understanding Of Lab Tests Results

Please visit the page about Immunoglobulin A on the site associated with The American Association for Clinical Chemistry for better understanding of tests. There you will find the most detailed and full information regarding lab tests. In “common questions” tab you will find answers on the most common questions.

In addition, you can use a special form to ask the question. It is useful, if there is no answer on your question on the web site. A laboratory scientist will answer your question. It is a part of voluntary service provided by the American Society for Clinical Laboratory Science.

What Is Immunoglobulin G

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Immunoglobulin G or IgG is one of the isotypes of Immunoglobulin. IgG is one of the most common antibodies in the blood circulation and represents nearly 75% of serum antibodies. The Immunoglobulin G is produced by plasma B cells and is crucial to the protection of body tissues against infection. It also protects the foetus in the utero from any infection. Immunoglobulin G is also responsible for the regulation of allergic reactions and can also prevent IgE mediated anaphylaxis. There are four subtypes of IgG named IgG1, IgG2, IgG3 and IgG4.

In some people owing to certain health condition the body produces low level of Immunoglobulin G causing IgG deficiency. People with IgG deficiency are prone to infections like

  • Sinus infection
  • Infections leading to throat infections

IgG deficiency can be seen in people suffering from kidney damage, leukaemia or other infections that makes the immune system weak making the body susceptible to further infections.

High levels of IgG means chronic infection like HIV/AIDS. The elevated IgG levels can also be due to Multiple sclerosis, autoimmune disorder and some types of cancer.

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What Is An Iga Test

An IgA test measures the blood level of immunoglobulin A, one of the most common types of antibodies in the body. Antibodies are proteins the immune system makes to recognize and get rid of germs.

Normally, high IgA levels are found in the body’s mucous membranes, especially the respiratory passages and gastrointestinal tract, and in saliva and tears.

Interpretation Of Reduced Igg Levels

Reductions in total IgG levels in adolescents or adults may be classified as mild-moderate , significant , or profoundly reduced . In adolescents and adults, a total immunoglobulin level greater than 600 mg/dL, with confirmed normal antibody responses, probably excludes humoral deficiency. Total immunoglobulin levels of 400 to 600 mg/dL or IgG levels of 200 to 400 mg/dL may contain adequate amounts of antibody this becomes less likely if total immunoglobulin levels are less than 400 mg/dL or serum IgG levels are less than 200 mg/dL.2,6

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In Addition To The Blood Sample For This Test I Was Instructed To Collect A Urine Sample Why

You may have been directed to give a urine sample to check for the presence of protein in your urine and/or to determine the amount and type of protein present in your urine. Your healthcare practitioner may suspect that, based on your medical history, signs and symptoms and/or other test results, you have a condition associated with abnormal or excessive immunoglobulin production. In such cases, a quantitative immunoglobulin test is often performed along with tests such as serum and urine protein electrophoresis to help establish a diagnosis.

Immunoglobulin Subclass Igg4 Serum

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Suggests clinical disorders or settings where the test may be helpful

Supporting the diagnosis of IgG4-related disease

Method Name A short description of the method used to perform the test


NY State Available Indicates the status of NY State approval and if the test is orderable for NY State clients.

Lists a shorter or abbreviated version of the Published Name for a test

Describes the specimen type validated for testing


Ordering Guidance

This test only quantitates the IgG4 protein. If quantitation of all IgG subclass types is wanted, order IGGS / IgG Subclasses, Serum.

Specimen Required Defines the optimal specimen required to perform the test and the preferred volume to complete testing

Patient Preparation: Fasting preferred but not required


Specimen Volume: 1 mL

Specimen Minimum Volume Defines the amount of sample necessary to provide a clinically relevant result as determined by the Testing Laboratory

0.5 mL

Identifies specimen types and conditions that may cause the specimen to be rejected

Gross hemolysis

Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the performing laboratory, alternate acceptable temperatures are also included

Specimen Type

Suggests clinical disorders or settings where the test may be helpful

Supporting the diagnosis of IgG4-related disease

0-< 5 months: < or =19.8 mg/dL

5-< 9 months: < or =20.8 mg/dL

9-< 15 months: < or =22.0 mg/dL

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