Immunoglobulin E (IgE) is a type of antibody. The immune system creates proteins known as antibodies to assist the body in defending itself against potential threats. The body produces several types of antibodies, including IgG, IgM, IgA, IgE, and IgD. Each of these antibodies is specific to an antigen that triggers the immune response. A small amount of immunoglobulin IgE is also present in the blood and plays a role in fighting allergies and parasitic diseases. 

What is an IGE Serum test?

A serum IgE level test is useful for diagnosing various diseases. One of its main applications is allergy diagnosis. Both food and seasonal allergies can be identified using this method. Another application is in diagnosing asthma. Although less common, eczema can also be detected using this test.

Purpose of IGE serum test

The purpose of a serum IgE test is to measure the total amount of IgE antibodies present in an individual's blood. This test can help identify diseases that may lead to allergies and also detect the presence of a parasitic infection.

The IgE test is used for diagnosing certain medical conditions such as:

• Hay fever and asthma
• Allergic bronchopulmonary aspergillosis is an allergic response to a specific type of fungal infection in the lungs.
• Inflammation in the skin, lungs, and other organs
• Cancers that are associated with the immune system and certain types of immunological diseases.

It can also be performed to monitor the effectiveness of a treatment, allowing doctors to modify the treatment strategy as needed.

When should one get this IGE serum test?

Usually, only specific situations warrant the use of a total IgE test. Your doctor may order a test to measure serum IgE levels if you show symptoms indicative of an allergic disease or some types of immune system disorders. These are the conditions for which the test may be ordered:

• Chronic allergic symptoms (sneezing, itchy eyes, nasal discharge)
• Asthma or wheezing
• Eczema
• Food or drug allergies
• Unknown causes of hives and itchiness
• Recurring infections or suspected immune disorders
• Suspected parasitic infections
• Tight throat
• Dermatitis
• Itching in mouth
• Nausea, vomiting
• Hives

The result of a serum IgE test needs to be considered with your symptoms and medical history.

How to prepare for the IGE serum test?

Before an allergy blood test, most people do not need to take any special precautions. In some cases, healthcare providers may ask patients to refrain from eating or drinking before the test. It's important to inform the provider if the patient is taking antihistamines, as they may request the patient to stop using them prior to the allergy blood test.

What happens during the IGE serum test?

A total IgE test requires a blood sample to be taken. This process typically takes place in a medical facility or hospital. One can return to their regular activities after the test. A serum IgE blood test has very few potential side effects. Minor soreness or bruising in the arm is possible, but these should subside soon.

IGE serum test Results

A person is likely to have an allergy if their IgE level exceeds the recommended threshold. However, IgE test results do not specify the exact allergy a person might be experiencing. If a person has a high total IgE level, they are more likely to have one or more allergies. The overall IgE level is influenced by the increase in allergen-specific IgE levels during exposure, followed by a subsequent reduction over time. The IGE blood test normal range may vary depending on the laboratory conducting the test and the specific unit of measurement used.

• Normal Range: The serum IGE test normal range indicates that an individual has no known allergies.
• High IgE Level: If a person's IgE levels are higher than usual, it may indicate allergies to specific foods or allergens.
• Extremely High IgE Level: Occasionally, IgE levels can be abnormally high, suggesting severe allergies that could potentially lead to an immunodeficiency condition.

Symptoms of High IgE

IgE levels being high alone do not produce any symptoms. The symptoms are caused by the disease that is causing elevated IgE levels. The common symptoms include:

• Sneezing, runny or stuffy nose
• Watery, itchy eyes
• Skin rash or itching
• Hives (urticaria)
• Wheezing, coughing or difficulty breathing
• Swelling when exposed to an allergen
• Digestive problems (nausea, vomiting, diarrhea) in case of food allergies
• Frequent infections (in rare immune disorders)

Conditions that Cause High IgE Levels

Increased levels of IgE are generally associated with an allergic disorder, although they may also be found in some infectious diseases, immune system disorders, and even some cancers.

• Allergy (most common): asthma, eczema, hay fever, food allergy
• Parasitic infections (worm infection)
• Allergic fungal diseases like Allergic Bronchopulmonary Aspergillosis
• Immune system disorders like Hyper-IgE syndrome
• Some persistent infections
• Very rare blood cancers like certain lymphomas and IgE myeloma

Increased IgE does not mean a diagnosis, as it needs to be considered in conjunction with clinical signs and other test results.

Conclusion

Allergies can range from being merely irritating to extremely uncomfortable or even hazardous. Fortunately, allergy testing with IgE is readily available, which can help identify the causes of allergies, enabling individuals to adjust their lifestyles to avoid those allergens. 

FAQs

1. What does the immunoglobulin IgE serum test for? 

Ans. The Immunoglobulin IgE Serum Test measures the level of IgE in the blood. It is used to diagnose certain allergic conditions like asthma and hay fever. 

2. Are there any risks associated with IgE serum tests? 

Ans. Blood tests for allergies pose no significant risks. Some individuals may experience minor bleeding, bruising, or pain at the site of the blood draw, but these symptoms typically resolve within a day or two.

3. What are the symptoms of a high IgE level? 

Ans. Elevated IgE levels can result in severe allergic reactions, including persistent sneezing, itchy or watery eyes, skin rashes, shortness of breath, and swelling of the face or throat.

4. Is it safe to take IgE Test?

Yes, an IgE test is a very safe and normal blood test which carries very few risks like slight pain and bruising from the needle prick.

5. What's the Best way to Lower IgE Test level?

The levels of IgE can be lowered through treatment of the cause of elevated levels of IgE. Discuss with a physician on how to achieve this.

6. Precautions to take before IgE Test?

There are no specific precautions needed, but let your physician know of any medication or health problem you might be having.

7. Is fasting required for IgE Test?

No, there is no need for fasting before an IgE test.

8. Is home collection of samples available in CARE Hospitals?

Yes, CARE Hospitals offers home sample collection for selected diagnostic tests in many locations. Availability may vary by city, so it's best to check with your nearest CARE Hospitals center.

Reference:
https://www.verywellhealth.com/ige-test-overview-6362110
https://www.testing.com/tests/total-ige/#:~:text=During%20a%20total%20IgE%20test,a%20vial%20or%20test%20tube.
https://medlineplus.g