> For the complete documentation index, see [llms.txt](https://help.sbtinstruments.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.sbtinstruments.com/maintenance/qc-test.md).
# QC test
Check that BactoBox® measures correctly.
## When to perform a QC test
Perform a QC test in these cases:
* **Every week you use your BactoBox®.**
* **When you insert a new flow cell.**
* After a [deep clean](/more/how-to-guides/deep-clean-your-setup.md) (of any length).
* When you replace the external filter or the tubing kit.
* When you install BactoBox®, move it, or get it back from service.
See [Maintenance schedule](/maintenance/maintenance-schedule.md) for more information.
## Which QC item do you have?
Ready-made QC vials make the weekly QC test quick, because there is nothing to prepare.
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