The facility has a rule (user facility programmed logic) configured in instrument manager to calculate the glomerular filtration rate (egfr).The egfr rule calculation factors in the results of test a and test b combined with patient race and sex to determine the kidney function index.Where patient sex (m or f) should be populated, a seven digit-number is being populated within the rule.This change causes the rule to be unable to calculate the egfr and instead returns "comment" as the result.A technician at the facility identified the result of "comment" in the egfr result field rather than a numeric result.There was no patient harm as a result of this incident.Due to the facility configured data purge settings, specimen related data was not available for evaluation.Due to the lack of data and the inability to recreate this issue, the investigation has not yet determined with certainty if this was a malfunction of instrument manager software.
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