Acceptace criteria for interlaboratory metod transfer

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Hello everyone,
I am looking for some acceptance criteria for interlaboratory non-statistical comparison for related substances method transfer for film coated tablets. Can you, please, advice me? Is there any guideline related to this topic?
Thank You!
1. We did such cGMP transfers to our QC and to contract manufacturers' QC several times a year.

2. Unfortunately, I cannot remember what our agreement values were for agreement to R&D values, or where the values came from.

Obviously, results had to meet cGMP system suitability criteria. This held for EACH OPERATOR at these locations. We supplied three samples previously assayed at R&D; each sample would be prepared from scratch three times, and each prepared sample was injected at least twice.

I think we used 98 – 102% agreement and standard deviation of 2 for each of the nine samples.
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