Immunizations Back-Up Technician Practice Test

Where are intradermal injections administered?

Directly into the skin or dermal tissue on the ventral surface of the forearms at least 2 inches from the bend of the elbow. Directly into the muscle of the upper arm. Into the subcutaneous tissue of the thigh. Into a vein in the wrist.

Correct Answer:

Directly into the skin or dermal tissue on the ventral surface of the forearms at least 2 inches from the bend of the elbow.

Explanation:

Intradermal injections deliver the substance into the dermal layer of the skin, just beneath the epidermis. The preferred site is the inner (ventral) surface of the forearm, about 2 inches from the bend of the elbow. This location is ideal because the skin here is thin and relatively flat, allowing a shallow injection that stays in the dermis and typically forms a small wheal, which helps confirm proper depth. This route is different from intramuscular injections, which go into muscle, and subcutaneous injections, which go into fatty tissue, or intravenous injections, which go into a vein.

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