Why would you administer an intradermal injection?

Intradermal injections are administered primarily for diagnostic purposes, such as allergy testing or tuberculosis screening, as they allow for a localized response in the dermis. This method provides a smaller volume of medication, which minimizes systemic absorption and maximizes localized effects. Additionally, intradermal injections are useful for certain vaccines, such as the BCG vaccine for tuberculosis, where a targeted immune response is desired.