iSTAT cartridge traceability

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We recently participated in a TJC inspection and the inspector told us that we needed to be able to provide traceability on our iSTAT cartridges once they left storage. We currently have cartridges signed out based on quantity and labeled with RT expiration, however this is apparently not enough. He questioned how can we prove the cartridge was used within the appropriate timeframe and we should be able to trace each cartridge back to a patient.

Has anyone dealt with this or have a process they would be willing to share that allows for this traceability? 
It was suggested that we provide refrigerators to the departments using our cartridges as well as Temptrak so we can remotely monitor but this seems like a very expensive option. 

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Are your i-STATs connected to any middleware that you can see the results?  You could log what you send and check for patient results within the RT timeframe.  You could ask for any cartridges that were not used within that timeframe to be sent back to you and you can mark it on a log or make it a part of your procedure that you communicate with the department that all expired cartridges are tossed.  As it is only a 5 minute warm up time, starting fresh at the end of the time period should not be difficult. That does seem extreme.  We spot check our ISTAT RT products and rarely find that there is an expired or non dated cartridge out for use.  If we find one we mark it on our QA report and throw out the cartridge.
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Good afternoon Monica, 
I used to have iSTATs but has since transitioned to epoc where the cartridges are stored at room temperature and are good until the manufacturer expiration date.
We used to deliver the cartridges to the testing units, making sure that the RT expiration date is written on each cartridge and not just on the box; we also made sure that we "cancel" the  manufacturer expiration date (blacking it out) on both the box and each cartridges, unless it is earlier than the RT exp. date.
During our weekly spot checks, we make sure to visit all those testing areas to make sure there are no expired or nearly expiring supplies. 
But then again, we are a fairly small volume hospital and this is easily doable - Really interested to see how big volume sites  accomplish this.
Having temptrak or even a fridge would be good but I am thinking that you would still be faced with the same question about how do you make sure that the cartridges are not used beyond their RT expiration date since Temptrak only monitors storage temps and not the expiration dates. By any chance, were you able to ask the inspector on any suggestions?

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