To check or not to check.
I just looked at our SOPs, and realized, that we don’t check our diluent. We check all the media used in the test for growth promotion qualities and sterility, (every lot is tested for it), but we never check our diluent.
So, if we get it ready - we have a certificate from the manufacturer.
If we prepare the diluent on site - we don’t even have that. Yes, we always use the same recipe …
So, should we check the diluent or not? Can it happen that unchecked diluent has some inhibitive properties? So bacteria (fungi) don’t grow in it?
What are the regulation requirements?