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Frequency of Re-Testing Working Standards (Secondary Reference Standard)

#1
Hi,

I have read all guidelines from ICH Q7, Annex 3 WHO, EU GMP etc to find the timeline of re-testing of a working standard.

All guidelines mention that there should be periodic re-testing of the working standard against the primary reference standard ( supplied by official pharmacopoeia). However they do not state the time line e.g., yearly, 2 year or so.


May I ask for the assistance to know, ''what should be the frequency of working standards re-testing ?''.

Many thanks in advance.
 
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