What is the needle length and gauge size for an intradermal injection?

The correct answer for the needle length and gauge size for an intradermal injection is 3/8 to 5/8 inch and 25 to 27G. Intradermal injections require a shorter needle because they are administered into the dermal layer of the skin, which is just beneath the epidermis. A needle length of 3/8 to 5/8 inch is sufficient to reach this layer without penetrating too deeply.

In addition, the gauge size of 25 to 27G indicates a thinner needle, which is appropriate for intradermal injections, as a finer gauge is less traumatic for the skin and allows for the slow absorption of the injected substance. This is particularly important for tests such as allergy tests or tuberculosis screenings, where the formation of a small wheal is desired.

Other options might suggest lengths and gauges that are either too long or too thick for the intended purpose, which would not be suitable for intradermal injections.