What does an intradermal injection involve?

An intradermal injection involves administering a medication or vaccine into the dermis layer of the skin. This method is specifically used for allergy tests, tuberculin skin tests, and certain vaccinations, as it allows for greater absorption of the substance due to the richness of blood vessels in that area. The technique creates a small wheal or bump below the skin’s surface, which indicates appropriate technique and dosage.

Injecting into the muscle or subcutaneous layer involves different techniques and purposes, primarily targeting the muscle tissue for more systemic absorption or the fatty tissue for slower release. Direct injection into the bloodstream would typically involve intravenous methods, not intradermal, which focuses on local skin layers. Thus, the process of intradermal injection is distinct and is crucial for specific applications in clinical practice.