Residual Solvents Validity of method



I got the USP Residual Solvents test method accredited.  However, the auditor would like to see "validity of results" through proficiency testing, inter-laboratory or intra-laboratory comparison.  No PT s are available.  I don't have a secondary analyst, but I do have two instruments now although one is dedicated for QC and another for R&D.  I can maybe run an intra-laboratory validation. 


What are your thoughts?  Any suggestions?


Stay safe,


Fadwa Al-Taher

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