What must the steam indicator show before using non-implantable instrumentation from the autoclave?

The requirement for the steam indicator to show a color change is critical for ensuring that the autoclave cycle was effective in sterilizing the instruments. The color change signifies that the conditions necessary for steam sterilization—such as temperature and pressure—were met during the cycle. This change indicates that the instruments have been properly sterilized and are safe for use in surgical procedures.

For proper sterilization, a chemical indicator is placed within the packaging of instruments. The change in color validates that the instruments have been exposed to the correct steam sterilization conditions, thereby ensuring that microorganisms have been destroyed. This process is essential for maintaining patient safety and preventing infections during surgical procedures.

The other choices do not meet the required validation for use. An unchanged indicator would suggest that the sterilization conditions were not met, while a partially visible indicator and an indicator with a timestamp do not provide relevant information regarding the sterilization effectiveness. Therefore, the color change is the key criterion that confirms the instruments are properly sterilized and ready for safe clinical use.