Helvic performs growth promotion tests of media used for environmental monitoring or in testing procedures that require confirmation that the media meets the specification in the Pharmacopeia. Growth promotion or fertility of the media is confirmed by testing against a previously certified lot of media. An alternative approach is to utilise a freshly prepared inoculum and to compare test results to those previously obtained with an approved batch of medium.

The Pharmacopoeial acceptance criteria for growth promotion of solid media states that these values should not differ by greater than a value of 2 from the calculated value for a standardised inoculum, i.e. (50-150%).

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