Which of the following is true about intradermal injections?

Intradermal injections are a specific route of administration where a small amount of medication is injected into the dermis, just below the epidermis. This method is particularly useful for allergy testing, as it allows for the evaluation of a person's reaction to specific allergens. When allergens are introduced into the dermis, they can produce localized immune responses that are clinically useful for diagnosis.

The volume typically administered for intradermal injections is quite small, generally less than 0.5 mL, making the mention of greater than 1 mL incorrect. Additionally, intradermal injections are performed at a 10 to 15-degree angle, distinctly different from a 90-degree angle utilized for intramuscular injections. Lastly, intradermal injections are not commonly performed in the deltoid area; instead, they are often administered on the forearm or back where there is less muscle and more skin surface available for testing. Thus, the assertion that intradermal injections are used for allergy testing accurately reflects the purpose and technique of this method of administration.