Which action is essential before using a sterilized pack?

The essential action before using a sterilized pack is checking for proper seal. This is a crucial step to ensure that the pack has remained sterile since the sterilization process. A proper seal indicates that the packaging has not been compromised, which is vital for maintaining sterility. If the seal is broken or compromised, there is a risk that the contents may be contaminated, making the sterilization process ineffective.

Ensuring the integrity of the seal is a standard practice in sterile processing that helps prevent infections and ensure patient safety. While other options such as storing the pack in a dark area, labeling it, and stacking it for easy access may be important for other reasons, they do not directly address the critical need to confirm the sterility of the pack before use. Thus, checking the seal is the most essential action prior to using the sterilized pack.