Method validation/verification

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Question: Is it necessary for an ISO 17025 accredited laboratory to validate/verify methods from: (1)the United States; British & European Pharmacopoeia (2) methods supplied by customers which have already been validated and (3) is it acceptable to use the system suitablity requirements as proof of ablity to adequately perform these methods? We take part in anual interlab profficiecy testing schemes, is this sufficient evidence of competency or should we have other procedures to prove competency?