What is true of the bottom shelf in sterile storage?

The bottom shelf in sterile storage is designed to be solid and positioned 8-10 inches above the floor to facilitate adequate air circulation and maintain the integrity of the sterile items. This height helps to prevent dust, moisture, and contaminants from the floor from coming into contact with stored items, which is essential to uphold sterility and prevent contamination. It also allows for easier cleaning of the storage area, ensuring a more hygienic environment.

The other choices do not meet the specific requirements associated with sterile storage. While instruments are undoubtedly an essential part of sterile processing, the bottom shelf is not typically designated for their storage due to contamination concerns. A vacuum seal is not a requirement for the storage shelves themselves; instead, it applies primarily to specific sterile supplies that need an airtight seal. Lastly, while adjustable shelving can be beneficial for maximizing storage space, the bottom shelf's primary focus is on height and maintaining cleanliness, rather than adjustability.