A client has undergone scratch testing but the causative allergen is yet to be identified. what would be the next step to confirm a strongly suspected allergen?

Begin intradermal testing

Explanation:

Begin Intradermal allergy testing is a skin testing tool that provides a strong reposne against any specific allergen.

The procedure involves injecting a small amount of the alleged allergens under the skin surface. The region is being checked for a reaction at the site after around 20 minutes.

As intradermal test are invasive, they will give quick response in comparison to scratch test which is unable to identify teh allergen.

Hence, the correct answer is Begin Intradermal testing.