<P> Intradermal injection is the injection of a substance into the dermis, just below the epidermis . This route has the longest absorption time as compared to subcutaneous injections and intramuscular injections . As a result, it is used for sensitivity tests, like tuberculin and allergy tests, and for local anesthesia . Additionally, the body's reaction to substances is more easily visible since it is closer to the surface . </P> <P> Common injection sites include the inner surface of the forearm and the upper back, under the scapula . </P> <P> Equipment include syringes calibrated in tenths and hundredths of a milliliter . The dosage given is usually less than 0.5 mL, less than given subcutaneously or intramuscularly . A 1 / 4" to 1 / 2" long and 26 or 27 gauge thick needle is used . </P>

Intradermal injections are administered correctly when the nurse