Upon investigation with the facility it was determined that a rule (user facility programed logic) went live in (b)(6) 2022 to resolve an issue with a beckman analyzer sending replicates of test results with the same test code which was incompatible with the labortatory information system (lis).Because the lis was unable to file this properly a rule was written to add a new, unique, test code in order to properly process the results.The rule was tested and validated by the facility prior to it being moved live in (b)(6) 2022.At an unknown time after (b)(6) 2022 the site was able to resolve the issue with the replicate test results on the instrument.At that time the rule became obsolete but was not deactivated.At the time that the incident was reported, when a result was received in the lis that was performed on two different analzers the rule was triggered under the previous condition of all repliactes having the same test code.The rule changed a valid result which made it incorrect.When this occurred the medical technician caught the bad result and it was not released nor did it impact patients.The site immediately stopped testing when this was noticed and started an internal investigation.During the investigation the site noted that they performed look backs and found 36 incorrect results released.The customer does do not have patient impact information as they do not know how many products were sold by their clients and if they were transfused into patients.The customer site does not have the patient impact information as they are a test service for blood donation sites and any recalls would need to be performed by the donation centers and not the facility.Once the result of the error was located the previously active rule was disabled and the site was able to successfully validate the system and restart production.While this is not a malfunction of the instrument manager medical device (rules were working as expected) it is being reported due to the facilites inability to provide a patient impact of the user error.
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