I just got cited for this checklist item. When I spoke with CAP, this was the response: TRM.31250 If expired reagents are used you must clarify that they were unavailable from the manufacturer at the time of use. (I was speaking to her about antigen typing sera, not RBC's) She stated that we must document in our records why we had to use the expired reagents (ex: on back order from manufacturer). I explained to her that we use expired RBC panel cells for rule outs ONLY and that we QC the panel with each use. She was okay with that statement, but anti-sera had to be within date even if we had QC that gave expected results, UNLESS it was on backorder or unavailable. So if hope this helps someone with this checklist item.