Which statement is true about intradermal (ID) injection volumes?

• A. ID uses the largest injection volume among the listed routes.
• B. ID uses the same as IV.
• C. ID uses the smallest injection volume among the listed routes.
• D. ID volumes vary widely.

Answer: (C)

Intradrmal injections use tiny volumes because the dermis has very limited space and the goal is to keep the material within the superficial skin layer to interact with dermal antigen-presenting cells. This small volume also helps create the characteristic bleb (a wheal) that confirms the injection stayed in the dermis. In practice, intradermal doses are about 0.1 mL or less, which is much smaller than typical volumes used for other routes. Subcutaneous injections routinely use around 0.5–1 mL or more, and intramuscular injections often accommodate 0.5–3 mL depending on site. IV dosing can involve even larger volumes. So the statement that intradermal injections use the smallest volumes among common routes aligns with how this route is designed and performed.