In the blood of healthy people, IgE antibodies make up less than 0.001% of all immunoglobulins. These IgE antibodies are key in triggering allergic responses when people sensitive to allergens come into contact with them.
Structurally, IgE resembles other antibodies, having two light chains and two heavy chains. The heavy chains have a special region that determines the antibody's specificity to antigens. Measuring IgE levels is clinically significant mainly because of its role in allergic reactions, even though IgE myeloma is a very rare condition.
IgE antibodies typically attach to mast cells and basophils in the bloodstream. When these cells interact with specific allergens, they release histamines and other compounds that start the allergic reaction. Around half of the people suffering from allergic rhinitis or asthma show high IgE levels, but it's also common for individuals with allergies and specific allergen sensitivity to have normal total IgE levels.
Research has found that people with atopic dermatitis often have raised total IgE levels, which appears to align with the severity of their eczema. Besides, elevated IgE can be indicative of parasitic infections, allergic bronchopulmonary aspergillosis, or certain immune deficiencies.
References:
Portnoy JM. Appropriate allergy testing and interpretation. Mo Med. 2011 Sep-Oct;108(5):339-43. PMID: 22073491; PMCID: PMC6188374.
Fadal RG. IgE-mediated hypersensitivity reactions. Otolaryngol Head Neck Surg. 1993 Sep;109(3 Pt 2):565-78. PMID: 8414585.
What does it mean if your Immunoglobulin E, Total result is too high?
A high level of Immunoglobulin E (IgE) can indicate a number of conditions, as IgE plays a critical role in the body's immune response, particularly to allergens. Here are some of the conditions associated with elevated IgE levels:
→ Allergic Diseases: High IgE levels are commonly associated with allergic reactions, including allergic rhinitis (hay fever), asthma, atopic dermatitis (eczema), and food allergies. In these conditions, the immune system overreacts to substances that are usually harmless, such as pollen, dust mites, certain foods, or animal dander.
→ Parasitic Infections: Elevated IgE levels can be a sign of parasitic infections, as these antibodies are part of the immune response against the invading organisms.
→ Immune Disorders: Some immune deficiency conditions, such as Hyper IgE Syndrome (also known as Job’s Syndrome), are characterized by very high levels of IgE.
→ Atopic Dermatitis: Patients with atopic dermatitis often have higher total IgE levels, and the level of IgE may correlate with the severity of the condition.
→ Allergic Bronchopulmonary Aspergillosis (ABPA): This is an allergic reaction to the fungus Aspergillus, which affects the lungs and can cause high IgE levels.
Additional note: It's important to note that while high IgE levels can be indicative of these conditions, they should be interpreted in the context of clinical symptoms and other diagnostic tests by your healthcare provider. Elevated IgE levels on their own do not confirm a specific diagnosis, as they can also be found in some individuals without any apparent health issues.
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What does it mean if your Immunoglobulin E, Total result is too low?
A low level of Immunoglobulin E (IgE) in the blood serum is generally indicative of an IgE deficiency. This deficiency may manifest clinically with a variety of symptoms and has been associated with conditions such as chronic fatigue, asthma, an increased risk of autoimmune and oncological diseases, chronic sinusitis or inflamed sinuses, and otitis media, which is fluid in the ear.
The clinical significance of very low IgE levels is not thoroughly understood, and the potential effects on the human immune system continue to be the subject of research. For example, while high IgE levels are commonly linked to allergies, parasitic infections, and certain immune deficiencies, the disorders that accompany very low IgE levels are less well-defined.
Selective IgE deficiency is characterized by a significant reduction in IgE levels while other immunoglobulin levels remain normal.
Additional note: It is important to note that this condition does not necessarily correlate with a clinical disorder, meaning that low IgE levels can be a laboratory finding without a corresponding illness. Moreover, the clinical characteristics of IgE deficiency, especially in patients with conditions like Common Variable Immunodeficiency (CVID), remain unclear. There is a need for further investigation to fully understand the implications of low IgE levels in such patients.
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