EU GMP: The integrity of the sterilised filter should be verified before use and should be
confirmed immediately after use by an appropriate method such as a bubble point, diffusive flow or pressure hold test.(EU GMP Annex 1 for the manufacture of sterile medicinal
products, February 2008)
US FDA: Integrity testing of the filter can be performed prior to process and
should be routinely performed post-use.(US FDA Guideline on Sterile Drug Products Produced by Aseptic Processing, 2004)