Review of the pcr curves for run # (b)(4) shows severe abnormalities, indicating that the result generated is erroneous.A system assessment determined that discrepancy is confirmed to be a false positive result due to disturbances in the data, most likely tube leaks, which affected the performance of the analyzer.Roche received complaints alleging invalid and/or false positive results with the cobas® sars-cov-2 & influenza a/b test for use on the cobas® liat® system for one or more targets (sars-cov-2, influenza a, influenza b).When reviewing the customer-provided data associated with the reported invalid and false positive results, abnormal pcr curves were observed.Per the on-going investigation, several potential causes for the abnormal pcr growth curves leading to invalids and false positives have been identified.These include tube leaks, abnormal pcr steps, and loose thermal sensor wiring.Overall across the installed base, these issues from product use may occur sporadically.For invalid or false positive influenza results, adverse health consequences are not likely.For invalid sars-cov-2, adverse health consequences are not likely since detectability is high and testing can be performed on alternative platforms.For erroneous positive sars-cov-2 results, there is the possibility of adverse health consequences in high risk individuals.As stated in the instructions for use, clinical correlation with patient history and other diagnostic information is necessary to determine patient infection status.A cobas liat software update to better identify the thermal sensor errors and a new cobas® sars-cov-2 & influenza a/b script to better detect abnormal pcr curves have been launched.The implementation of both the software and the updated script have shown a reduction in the calculated false positive rate.Consignees have been notified.(b)(4).
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In light of the covid-19 pandemic and the subsequent emergency use authorizations (euas) for sars-cov-2 diagnostic tests.The agency has requested heightened reporting beyond the reasonably suggests requirements of 803 to include allegations of false positive or false negative results independent of harm or malfunction or off-label use.Pursuant to the agency¿s instruction, we hereby submit this mdr.A customer alleged a discrepant result generated while using the cobas® sars-cov-2 & influenza a/b nucleic (scfa) acid test for use on the cobas® liat® system.The customer reported that the initial patient sample was tested with the cobas® liat® system and generated sars-cov-2 negative influenza a positive and influenza b negative.Subsequently, the same sample was retested with the same device and generated sars-cov-2 negative influenza a negative and influenza b negative.The negative results were reported to the patient and or/ medical personnel treating the patient.No apparent harm or injury occurred in relation to the event.An investigation was conducted to evaluate the customer¿s allegation.
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