What it measures
The test measures IgE antibodies against one named allergen, such as peanut, grass pollen, cat or house dust mite. Each allergen is a separate test, and panels group several together. A raised result shows the immune system is sensitised to that allergen.
Why people test it
- Used with a history of symptoms to look into a suspected food, pollen, pet or insect allergy.
- Chosen when skin prick testing is not suitable, such as with widespread eczema or antihistamine use.
- Used to follow some childhood food allergies over time.
Typical range
Results are given in kUA/L, and some labs also give a class. Cut-offs vary by lab, method and allergen, and your report shows the lab's own cut-off. A positive result shows sensitisation, not that the allergen will cause a reaction, so it is read alongside symptoms.
Finger-prick or vein?
A finger-prick sample is usually enough for a few allergens. Larger panels need more serum, so a vein sample is often taken when many allergens are tested.