What gauge needle is typically used for administration of an intradermal injection?

The commonly used gauge for intradermal injections is in the range of 25 to 27G. Intradermal injections are administered into the dermis, just beneath the epidermis, which requires a thinner needle to minimize tissue damage and facilitate accurate placement of the medication. The smaller gauge numbers represent thicker needles, which are more suitable for intramuscular or intravenous use, but can be excessive for intradermal applications.

Using a gauge in the 25 to 27 range allows for a more controlled injection and is ideal for procedures such as allergy testing or tuberculin skin tests, where a small volume of fluid needs to be injected precisely. This range promotes proper skin displacement, creating a small bleb or wheal, which is essential to confirm that the medication has been administered correctly within the dermal layer.