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Allergy

Question
Posted by: | 2020/03/01

Q.

Allergen testing for hives

Do i need to stop antihistamines for 3 days before conducting blood testing for allergens such as food and inhalants or is that only for skin prick tests that antihistamines need to be stopped.

Expert's Reply

A.

Allergy expert
- 2020/03/05

Antihistamines affect the skin prick test by reducing the skin reactions and making results difficult to interpret.  Antihistamines do not affect the allergy RAST blood test results.

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