B) Retrospective validationRetrospective validation is used for facilities, processes, and process controls in operation use that have not undergone a formally documented validation process. Validation of these facilities, processes, and process controls is possible using historical data to provide the necessary documentary evidence that the process is doing what it is believed to do. Therefore, this type of validation is only acceptable for well-established processes and will be inappropriate where there have been recent changes in the composition of product, operating processes, or equipment.
This approach is rarely been used today because it’s very unlikely that any existing product hasn’t been subjected to the Prospective validation process. It is used only for the audit of a validated process 选自:http://www.kneat.com/2012/03/29/the-four-types-of-process-validation/ 按照这种说法,回顾性验证正如以前说的是针对前面没有执行prospective validation或者不充分,不正式(或者我们理解的legacy problems)。现在是不太实用的或者很少使用(特别是对于高风险的process validation),是因为现在一般要求都是前验证,所以相对而来回顾性验证是作为相对于一个补充audit了。对于某些设备,设施等部分风险较低的确认或验证,考虑到其前验证涉及的时限和经济问题,在science-based或者risk-based的评估下,为什么不可以进行retrospective validation(qualification)呢。这个个人觉得也是允许的,所以在FDA,EU的qualification and validation指南中在general提及的一下,但是在下面分的章节中只是在process validation中进行了强调的呢。
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