## When to perform a QC test
Perform a [QC test](https://help.sbtinstruments.com/getting-started/qc-test) in these cases:
* **At least once a week.**
* After a [deep clean](https://help.sbtinstruments.com/protocols/best-practices/deep-clean-1) (of any length).
* When you change your BactoBox® setup.\ Example: You replace the flow cell.\ Example: You replace the external filter.\ Example: You replace the tubing kit.
* When you switch from the SBT dilution vial to the [DIY dilution vial](https://help.sbtinstruments.com/protocols/do-it-yourself-diy/assemble-dilution-dispenser).
* As part of [qualification](https://help.sbtinstruments.com/getting-started/qualification).
See [maintenance](https://help.sbtinstruments.com/protocols/maintenance "mention") for more information.
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