Intradermal injection, often abbreviated ID, is a shallow or superficial injection of a substance into the dermis, which is located between the epidermis and the hypodermis. This route is relatively rare compared to injections into the subcutaneous tissue or muscle.

What are intradermal injections used for?

Intradermal injection provides a local and very little systemic effect. It is commonly used for tuberculin skin testing but can also be used for allergy testing and local anesthetics. To give an intradermal injection, a 25-gauge or smaller needle is inserted just under the epidermis at an angle of approximately 10°.

What is an example of intradermal injection?

Examples of intradermal injections include tuberculosis (TB) and allergy testing.