Final answer:
Good housekeeping is the control measure that ensures baseline tests will be available when needed by promoting an organized environment for efficiently storing and retrieving records.
Step-by-step explanation:
Besides record keeping, the control measure that ensures baseline tests will be available when needed is good housekeeping. This practice involves maintaining an organized and clutter-free environment, which helps in locating and retrieving necessary records efficiently. It includes proper labelling, systematic storage, and regular review of records to ascertain their availability and usefulness. It's not just about cleanliness; it's a critical aspect of operational management that directly impacts safety and efficiency.
Medical surveillance is a systematic approach to monitor employees' health over time, but it doesn't guarantee the availability of baseline tests itself. Engineering controls modify equipment or processes to reduce exposure to hazards, and work practices describe the ways tasks are performed, neither of which directly ensure the accessibility of baseline tests.