Which item is included in the secondary medical kit?

The inclusion of a 21 gauge needle in the secondary medical kit is appropriate due to its versatility and use in clinical settings. A 21 gauge needle is commonly used for various medical procedures, such as drawing blood or administering injections that require a larger gauge for efficient flow of fluids or medications. This makes it an essential item for a secondary medical kit, which is intended to address a range of medical needs in non-emergency situations.

In contrast, while a reflex hammer, pinwheel, and tuning fork are valuable tools for neuromuscular assessment and sensory testing, they serve more specialized functions that may not be as broadly required in typical secondary medical kit applications. The primary goal of the kit is to have items that facilitate immediate medical treatment, where a needle's capabilities are more aligned with urgent care needs.