Intradermal Injection (ID Injection)

Definition - What does Intradermal Injection (ID Injection) mean?

An intradermal (ID) injection is when a substance or medication is injected into the dermis, which is just below a layer of surface skin called the epidermis. This route is used to administer very small amounts of medication, up to 0.5 milliliters.

FertilitySmarts explains Intradermal Injection (ID Injection)

Common sites for intradermal injection include the inner surface of the forearm, upper back under the shoulder blade, and upper chest. ID injections use a very small needle positioned at a 10-15 degree angle to the surface. After the injection, a small blister appears under the skin.

Potential side effects are redness and irritation at the injection site.

The other two types of injection include subcutaneous (injection into the fat layer beneath the skin) and intramuscuar (into the muscle). The advantage intradermal injection has over the other two methods is that it is an easily accessible. This route takes the longest to absorb which is useful for sensitivity tests such as allergy tests or Tuberculin (TB).

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