We have a receipt log sheet for each reagent that specifies the incoming acceptance criteria for the reagent at the top, followed by the "prior to use" QC that is required. Our in-use and new lots are segregated on different shelves. I also record when ordered, when received, and when activated, along with the required information that is listed at the top of the sheet, such as insert checks, visual verifications, QC performed, acceptance (Y/N), and a comment section for quarantines. All historical information about the reagent is on the same sheet. Each type of reagent will have different acceptance criteria, QC, etc -- there is no remembering by the techs -- they just have to read what's written on the sheet. There is no defined criteria for reagents, other than running QC before use. You have to decide on whatever makes you sleep at night ...