USP 841 Relative Density lab controls You must keep written records

You must keep written records required by this part for 1 year past the shelf life date

then stored without mix-up or contamination

the lot and any other implicated lots must be quarantined and an out of specification (OOS) investigation conducted to determine the validity of the result

and contact surfaces you must take measures to exclude from any operations any person who in the opinion of a supervisor appears to have a health condition such as illness

USP 841 Relative Density lab controls You must keep written recordsSOP for the measurement of density or specific gravity by Quality Control by weighing a sample in a glass or stainless steel Pycnometer of a known volume and comparing to purified water