The investigation has determined that a higher than expected creatinine result was obtained from a vitros performance verifier quality control fluid using vitros chemistry products crea slides lot 1537-3513-1390 on a vitros 5600 integrated system.The assignable cause of the higher than expected vitros crea quality control results is a suboptimal calibration.The cause of the suboptimal calibration is likely due to an issue related to the preparation of vitros cal kit 1 lot 0121.A finn pipette was used to initially reconstitute the vials of vitros cal kit 1.The instructions for use (ifu) for vitros cal kit 1 recommends using either a class a volumetric pipette or an automated pipette due to the sensitivity of the reconstitution process in maintaining the accuracy of the products.Recalibration with freshly prepped calibrator fluids using volumetric pipettes resolved the issue.Although precision testing was not performed on the vitros 5600 integrated system an instrument related issue is not a likely contributor of the event as vitros crea reagent lot 1537-3513-1390 yielded acceptable qc results in combination with the vitros 5600 integrated system after a recalibration event without any troubleshooting actions being performed on the instrument.Email address for contact office is (b)(4).
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