How should an intradermal injection be positioned in relation to the angle?

For an intradermal injection, the needle should be inserted at a shallow angle, typically between 10 to 15 degrees. This specific angle allows the medication to be deposited just beneath the epidermis, creating a small bleb that is indicative of a successful intradermal injection. The shallow angle is crucial because it ensures that the needle tip is positioned correctly within the dermal layer, allowing for optimal absorption of the substance while minimizing the risk of penetrating deeper tissues, such as the subcutaneous layer.

When the angle is too steep, there is a higher likelihood of injecting into the subcutaneous tissue instead of the dermis, which would not achieve the desired effect of the intradermal injection. Each of the other angles provided would be inappropriate for this type of injection, as they either risk deeper penetration or do not allow for precise placement in the dermis. Thus, the 10-15 degree angle is optimal for ensuring the success of intradermal injections.