H6: investigation: the complaint investigation for discrepant results with the kit bd max mrsa xt (ref.(b)(4)) lot 1203082 was performed by the review of the manufacturing records, retain material testing, review of customer¿s data and verification of complaints history.Review of the manufacturing records of bd max mrsa xt indicated that the lot was manufactured according to specifications.The retain material of bd max mrsa xt from lot 1203082 was tested in positive.All reactions gave positive results, as expected.Customer reported a false negative result on a patient sample with the bd max¿ mrsa xt assay from lot 1203082.The sample was retested with the genexpert mrsa assay and gave a mrsa positive result.Customer provided one run file (#4842) from instrument ct0741 for investigation.Run 4842 contained 11 samples tested with the bd max¿ mrsa xt assay lot 1203082.Sample analyzed in position b11, identified as false negative by the customer, gave a mrsa negative result.Manual curves adjudication was performed for this sample and revealed a true amplification in the mrej target (fam channel) and no amplification in the rox channel.Since both targets must amplify in order to give a mrsa positive result, it explains why this sample resulted in a negative result.No anomaly was observed in the curves.As mentioned in the package insert, results such as those obtained for this sample could correspond to a meca/c drop out s.Aureus strain.However, since no sample was received for the investigation, it is not possible to confirm this hypothesis.Overall, no reagents issue is suspected.There is no indication of an increase in complaints for discrepant results for the bd max mrsa xt kit lot 1203082.The root cause was not identified.Is it possible that the discrepant results can be explained by a meca/c drop out s.Aureus strain.The reagents are not suspected of being in cause.Bd cannot confirm the complaint based on the investigation that was performed.Bd did not initiate a corrective and preventive action plan (capa).Bd quality will continue to monitor for trends.
|