Intradermal

Definition

Intradermal refers to the administration of a substance directly into the dermis, the layer of skin beneath the epidermis. This method is often used for diagnostic tests and certain vaccines.

5 Must Know Facts For Your Next Test

1. Commonly used for allergy testing due to its localized response.
2. Intradermal injections result in a small raised bump called a wheal.
3. Less common than subcutaneous and intramuscular injections but essential for specific immunological tests.
4. Utilized in the Mantoux test for tuberculosis screening.
5. Requires precise technique to avoid injecting into deeper layers of skin.

Review Questions

• Why are intradermal injections preferred for allergy testing?
• What is a wheal, and how is it related to intradermal injections?
• Describe one diagnostic application of an intradermal injection.

Related terms

Subcutaneous: Injection administered into the tissue layer between the skin and muscle.

Intramuscular: Injection delivered directly into a muscle.

Mantoux Test: A diagnostic tool for tuberculosis involving an intradermal injection of purified protein derivative.