What is the primary purpose of intradermal injection?

The primary purpose of intradermal injection is to deliver medication just beneath the skin for testing purposes. This method targets the dermis layer, allowing for localized reactions or tests to be observed, such as allergy tests or tuberculin skin tests. By placing the medication in this specific layer, healthcare providers can assess how the body reacts to the substance, which is critical for diagnosing allergies or infections. Intradermal injections typically involve a small volume of fluid and are administered using a fine needle to ensure precise placement and minimal discomfort. This technique is distinct from other injection methods, like intramuscular or subcutaneous injections, which serve different purposes related to medication absorption and administration.