What is the usual angle for intradermal injections?

The usual angle for intradermal injections is 15 degrees. This specific angle is important because intradermal injections are administered into the dermal layer of the skin, which lies just below the epidermis. By using a very shallow angle of 15 degrees, the needle tip is able to create a small bleb or wheal under the skin without penetrating too deeply into the subcutaneous tissue. This method is particularly significant in vaccination practices, allergy testing, and tuberculin skin tests, where accurate placement within the dermis is crucial for effective and safe administration of the substance.