What must be documented in an autoclave’s sterilization indicators to verify proper sterilization?

• A. A color postcard from the sterilization batch.
• B. Only the timer setting.
• C. Biological indicators (spore tests) and chemical indicators showing exposure and correct parameters.
• D. Only the operator's initials.

Answer: (C)

The key idea is that proving proper sterilization relies on two levels of indicators: chemical indicators and biological indicators. Chemical indicators—like autoclave strips or tape that change color or display a parameter—show the cycle ran and reached the required temperature, pressure, and time. However, they only confirm that the load experienced the right conditions, not that all microbes were killed. Biological indicators, or spore tests, are the definitive check: they test whether highly resistant organisms were destroyed during the cycle. If the biological indicators show no growth, you have evidence the sterilization was effective. Therefore, documenting both the chemical indicators confirming exposure and the biological indicators confirming sterility provides the necessary proof. The other options don’t verify sterilization on their own—color postcards, just the timer setting, or initials don’t demonstrate that the load was actually sterilized.