Total IgE
total IgE · immunoglobulin E · IgE blood test · allergy blood test
This is a blood test from a vein. It shows the total level of antibodies linked to allergies.
For a possible allergy, asthma, atopic dermatitis (eczema), and sometimes for possible worms.
⏱ Duration: the blood draw takes 3 to 5 minutes; results usually come in 1 to 3 days
Be sure to tell your doctor
How to prepare
- Food. Usually fasting, 4 to 8 hours without food. Water is fine. Check with the lab.
- The day before. No alcohol, fatty food, or hard workouts.
- Medicines. Do not stop them on your own. Tell your doctor what you take.
What to bring
- Your test request form
- Your ID
How it goes
- You sit down and rest your arm on the armrest
- A band is tightened above your elbow, and the skin is wiped
- Blood is drawn into a tube
- The needle comes out, and a cotton pad is pressed on
What you'll feel
- A quick prick, like a pinch
Afterwards
- Press the cotton pad for 3 to 5 minutes
- Results usually come in 1 to 3 days
- This test does not show what exactly you are allergic to. There are separate tests for that
Common questions
If IgE is normal, does that mean no allergy?
Not necessarily. It can be normal even with an allergy. Your doctor looks at it together with your symptoms.
Why is my child's IgE high?
There are many reasons: allergy, worms, or eczema. Your doctor will find out which.