Hi All,

This is a very interesting question that I had not thought about before. As was mentioned above if any changes, upgrades, or repairs occur on a machine it would need to be re-validated. However if no changes were made and the equipment was simply kept calibrated and regular maintenance was done, there should be no need for re-validation. If a piece of equipment has not gone through any changes it would seem it would not need a re-validation; however I believe that most companies would put a time stamp on validation, ensuring that yearly or quarterly the equipment is re-validated.

-Andrew Nashed