FSIS plans to update its Chemistry Laboratory Guidebook method CLG-PST5, “Screening for Pesticides by LC/MS/MS and GC/MS/MS”. Effective April 1, 2022, the update will reduce sample preparation time by using a new sample blending process on all National Residue Program samples.

The new blending process does not require dry ice, thereby increasing laboratory efficiency, and has no adverse impacts on method performance. Stakeholders will benefit by having pesticide results reported up to one day sooner. This new process will also improve laboratory health and safety since dry ice can present burn and inhalation hazards. The updated method will be available on the FSIS Chemistry Laboratory Guidebook website on April 1, 2022.