ou still need to check if your results are valid. So you don't get any false negative or false positive...
Everything in food is science. The only subjective part is when you eat it. - Alton Brown.
We have checked external lab more then 200 results (including PCR). but we didn't get any positive results.
If false negative came it was vary in the external lab results.
Is the Positive control is mantatory to test with sample?
Because we can justify with ILC results.
Hi Bala Prasanna,
also see -
All this probably comes into the general arena of "Micro. Procedure Validation".
These documents may assist -
mic1 - Procedure media preparation and growth promotion test.pdf 140.25KB
mic2 - Procedure for Validation of Shelf Life of Prepared Micro.Media.pdf 254.11KB
mic3 - Procedure for Micro. Media preparation.pdf 115.18KB
mic4 - aoac_validation_guidelines_for_food_microbiology.pdf 660.05KB
mic5 - micro. method validation US EPA.pdf 1.08MB
mic6 - FDA Guidelines Validation methods detection pathogens in foods-Feeds,2015.pdf 1.19MB
mic7 - Media growth validation, test methods.pdf 1.84MB
Ideally, the lab should probably be doing all these various validation exercises.
In practice it likely depends on what yr iso certification etc demands and what you are actually talking about, eg the latter's safety significance/results etc.
For example, IMEX, an unbroken, extended, history of negative results for something like Salmonella in a raw food is likely a cause for alarm.
Edited by Charles.C, 09 November 2019 - 10:47 AM.