A member asked:

So i had to give in and take a zyrtec (cetirizine) bc of the chronic hives i have. my eyelids started to swell. is skin food testing not reliable bc of them?

A doctor has provided 1 answer
Dr. John Chiu answered

Reliable when: Blood test to foods (IgE) is meaningful when highly positive but may give false-negative results. Food allergy is an uncommon cause for chronic hives although it can cause acute hives within 2 hours after ingestion of the allergenic food.

Answered 5/20/2015

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