Allergy Tests (IgE and Skin Prick)
Tests that help identify what you're allergic to, using a blood test or skin prick test.
Quick Summary
To identify triggers for hay fever, asthma, food allergy and eczema.
Specific IgE antibodies in blood, or skin reactions to small amounts of allergens.
For skin tests, stop antihistamines a few days before, as advised.
Overview
Results must match your symptoms; a positive test without symptoms doesn't always mean allergy.
Skin prick tests are done by trained staff because reactions can occur.
What It Measures
Specific IgE
Allergy antibodies to particular substances.
Skin prick response
Swelling at test sites.
How It's Performed
- 01
Preparation
Usually no special preparation. Tell the staff about medicines you take.
- 02
Blood sample
A small amount of blood is taken from a vein in your arm with a thin needle.
- 03
Afterwards
Press on the spot for a minute. A small bruise is common; you can go back to normal activities.
Interpreting Results & Next Steps
Discuss with Doctor
Normal ranges differ between laboratories, ages and sexes; always use the range printed on your report and ask your doctor what your results mean.
If values are High:
Positive results show sensitisation; your doctor relates them to symptoms.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Allergy Blood Test(opens in a new tab) · MedlinePlus, US National Library of Medicine
- Allergy skin test(opens in a new tab) · MedlinePlus, US National Library of Medicine