Book IgE (Immunoglobulin E) Test

The Immunoglobulin E (IgE) test is a blood test that measures the total level of IgE antibodies in the blood. Immunoglobulins are proteins produced by the immune system to identify and neutralise foreign substances. IgE is a specific class of immunoglobulin that plays a central role in the body's allergic response and defence against parasitic infections. When the body encounters an allergen such as dust, pollen, pet dander, certain foods, or insect venom, it triggers the production of IgE antibodies specific to that allergen. These IgE antibodies then bind to immune cells and cause the release of chemicals such as histamine, which produce the classic symptoms of an allergic reaction including sneezing, itching, hives, swelling, and in severe cases anaphylaxis. In India, allergic conditions represent one of the fastest growing categories of chronic disease. Rising urbanisation, air pollution, changing dietary patterns, and increased exposure to indoor allergens have significantly increased the prevalence of allergic rhinitis, asthma, atopic dermatitis, and food allergies across all age groups. The total IgE test is the first and most important step in evaluating a patient with suspected allergic disease, providing a broad measure of the overall allergic burden before specific allergen testing is pursued. The test involves a simple blood draw of approximately 2 ml from a vein in the arm and is completed in under five minutes.

Doctors prescribe an IgE test in the following situations: Investigating allergic conditions in patients presenting with recurrent sneezing, nasal congestion, watery eyes, skin rashes, hives, itching, or unexplained swelling. A significantly elevated total IgE confirms an allergic basis for the symptoms. Diagnosing and assessing the severity of allergic asthma, which is one of the most common chronic respiratory conditions in India. Elevated IgE is a key marker in atopic asthma and influences treatment decisions including the use of anti-IgE biological therapy such as omalizumab. Evaluating atopic dermatitis, also known as eczema, where total IgE levels are frequently very high and correlate with disease severity. Atopic dermatitis is increasingly common in Indian children and adults living in urban environments. Screening for parasitic infections including intestinal worms, which remain prevalent in many parts of India, particularly in children and in areas with poor sanitation. Parasitic infestations cause a significant and sustained elevation of total IgE. Investigating food allergies in patients with recurrent gastrointestinal symptoms, skin reactions, or anaphylactic episodes following food consumption. Elevated total IgE prompts further specific food allergen testing. Evaluating drug allergies and reactions to insect stings where IgE-mediated hypersensitivity is suspected. Monitoring patients on immunotherapy or anti-IgE biological treatment to assess the response to therapy over time.

The IgE test measures the total concentration of Immunoglobulin E antibodies in the blood, reported in International Units per millilitre (IU/mL) or kilounits per litre (kU/L). Normal IgE Range in India Total IgE levels vary significantly by age and are also influenced by geographic location and environmental allergen exposure. The standard reference ranges used across most Indian diagnostic laboratories are as follows. For adults, a normal total IgE level is generally below 100 IU/mL. However, in India the upper limit of normal is often considered up to 150 IU/mL due to the high background exposure to environmental allergens and the prevalence of subclinical parasitic infections that can cause a mild physiological elevation of IgE. For children, normal IgE levels are lower in infancy and gradually rise through childhood before plateauing in adulthood. Reference ranges for children are age-specific and will be indicated on the laboratory report. Interpreting IgE Results A total IgE between 100 and 500 IU/mL indicates a mild to moderate elevation and suggests atopic disease or a low-level parasitic infection. This range is extremely common in Indian patients with allergic rhinitis, mild asthma, or eczema. A total IgE between 500 and 2000 IU/mL indicates a significant elevation and is associated with moderate to severe atopic disease, active parasitic infection, or allergic bronchopulmonary aspergillosis. A total IgE above 2000 IU/mL indicates a very high allergic burden and is seen in severe atopic dermatitis, heavy parasitic infestations, hyper-IgE syndrome, or certain immunodeficiency disorders. This level warrants urgent specialist evaluation. It is important to note that a normal total IgE does not completely rule out allergy. Approximately 20 to 30% of allergic patients have normal total IgE levels, which is why specific allergen IgE testing may be required even when total IgE is within range.

Preparation for an IgE test is minimal. Fasting is not required. You can eat and drink normally before sample collection. If IgE is part of a larger panel that includes fasting tests, fast as advised by your doctor. Our team confirms preparation requirements at the time of booking. Antihistamine medications do not significantly affect total IgE levels and do not need to be stopped before this test. However, if you are also having specific allergen skin prick testing on the same day, inform your doctor as antihistamines can affect skin test results. Inform the phlebotomist about all medications and supplements you are currently taking, particularly immunosuppressants or biological therapies, as these can influence IgE levels and affect result interpretation. Stay normally hydrated before sample collection. Drinking water normally before the test is recommended. There are no dietary or lifestyle restrictions specific to the IgE test beyond the guidance above.

If you are booking through the SecondMedic platform the IgE test price starts at approximately Rs. 1,337. The exact price will be confirmed at the time of booking through SecondMedic. If your doctor has prescribed multiple tests alongside IgE, SecondMedic health packages include IgE as part of a broader allergy or immunology panel at a significantly lower combined price.

SecondMedic provides home sample collection for IgE test across all major areas. You do not need to visit a lab or collection centre. A certified and trained phlebotomist comes to your home or workplace at your chosen time, collects the sample using sterile single-use equipment, and ensures it is transported to the NABL-accredited lab within the required time window for accurate processing. Please note that SecondMedic provides free home sample collection on all tests priced above Rs. 300. Our team will check your pincode and confirm if your address falls under our free sample collection eligibility criteria, which depends upon the lab location and phlebotomist availability. Home collection is available between 7 AM and 10 PM, seven days a week, including Sundays and public holidays. Enter your pincode on the booking page or call our helpline to confirm availability at your address.