Serum Immunoassay for IgE Antibodies (Total Immunoglobulin E)

This test measures the levels of specific substances in your body, such as cells, chemicals, proteins, or hormones in a blood, urine, or tissue sample. The results help your healthcare provider evaluate how well certain organs are working, check for signs of infection or disease, and monitor existing health conditions over time.

IgE is a type of antibody produced by your immune system in response to allergens (substances like pollen, dust, or certain foods) or in conditions like asthma, eczema, or parasitic infections. Elevated IgE levels may suggest an allergic reaction or an overactive immune response.

Your doctor may order this test if you have symptoms that need a closer look, as part of a routine checkup, to screen for certain conditions, or to see how well a treatment is working. It can also help identify risk factors early, before they lead to more serious health problems, and guide decisions about your ongoing care.

Your healthcare provider may order this test if you have symptoms of allergies (e.g., sneezing, itching, rash) or if you’re being evaluated for conditions like asthma, food allergies, or chronic hives. It can also help diagnose certain immune disorders or check for exposure to parasites.

Your healthcare provider will give you specific instructions before your appointment. Depending on the test, you may need to fast for a certain number of hours, avoid certain medications or supplements, or drink extra water. Tell your care team about any medications you take, allergies you have, or bleeding problems, and plan to arrive a few minutes early with your photo ID and insurance card.

No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test if it involves drawing blood from your arm. Wear a loose shirt for easy access.

During the test, a trained healthcare professional will collect a small sample, usually by drawing blood from a vein in your arm or asking you to provide a urine sample. The process typically takes only a few minutes. You may feel a quick pinch or slight discomfort during a blood draw, but most people tolerate it very well. A small bandage will be placed over the site afterward, and you can usually return to your normal activities right away.

A healthcare professional will insert a small needle into a vein in your arm to draw blood. This process is quick and typically painless, though you may feel a brief pinch. The blood sample is then sent to a lab for analysis.