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Patient 1
A SIEMENS FIELD SERVICE ENGINEER (FSE) WAS SENT TO THE CUSTOMER SITE FOR SYSTEM INSPECTION. NO MECHANICAL ISSUES IDENTIFIED. THE CUSTOMER HAD PLACED SAMPLES ON FOR CEA TESTING SUBSEQUENT TO THIS ISSUE A FEW DAYS LATER. THE ISSUE APPEARS TO HAVE BEEN AN ISOLATED EVENT. THE INITIAL ISSUE WAS REPORTED AS CEA LOT 178, DISCORDANT PATIENT RESULTS. THE CUSTOMER SERVICE ENGINEER (CSE) REVIEWED THE ISSUE AND RESULTS WITH THE CUSTOMER. THEY DETERMINED THAT THIS ISSUE OCCURRED WITHIN A CONFINED TIME PERIOD TOWARD THE END OF THE RUN ON (B)(6) 2019. THEY REVIEWED THE RUNS FROM THAT DAY AND DAYS BEFORE AND AFTER AND COULD FIND NO OTHER DISCORDANT RESULTS. THEY REVIEWED THE EVENT LOGS AS WELL AS CALIBRATION AND QUALITY CONTROL (QC) RESULTS WITH ALL RESULTS IN RANGE AND ACCEPTABLE. THEY PERFORMED CALIBRATION AND QC TO VERIFY SYSTEM PERFORMANCE WITH ALL RESULTS IN RANGE. WHILE THE ISSUE MAY HAVE BEEN RELATED TO REAGENT OR SAMPLE PREPARATION, THE CAUSE COULD NOT BE DETERMINED. NO FURTHER ISSUES WERE REPORTED. THE INSTRUCTION FOR USE (IFU) IN THE INTERPRETATION OF RESULTS SECTION STATES: "RESULTS OF THIS ASSAY SHOULD ALWAYS BE INTERPRETED IN CONJUNCTION WITH PATIENT'S MEDICAL HISTORY, CLINICAL PRESENTATION AND OTHER FINDINGS." THE INSTRUCTION FOR USE (IFU) IN THE LIMITATIONS SECTION STATES: "WARNING DO NOT USE THE ADVIA CENTAUR CEA IMMUNOASSAY AS A SCREENING TEST FOR DIAGNOSIS. NOTE DO NOT INTERPRET LEVELS OF CEA AS ABSOLUTE EVIDENCE OF THE PRESENCE OR THE ABSENCE OF MALIGNANT DISEASE. MEASUREMENTS OF CEA SHOULD ALWAYS BE USED IN CONJUNCTION WITH OTHER DIAGNOSTIC PROCEDURES, INCLUDING INFORMATION FROM THE PATIENT'S CLINICAL EVALUATION. THE CONCENTRATION OF CEA IN A GIVEN SPECIMEN DETERMINED WITH ASSAYS FROM DIFFERENT MANUFACTURERS CAN VARY DUE TO DIFFERENCES IN ASSAY METHODS, CALIBRATION, AND REAGENT SPECIFICITY. CEA DETERMINED WITH DIFFERENT MANUFACTURERS' ASSAYS WILL VARY DEPENDING ON THE METHOD OF STANDARDIZATION AND ANTIBODY SPECIFICITY."