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Full patient identifier is (b)(6).The customer did not provide patient demographics such as age, date of birth, sex, weight, ethnicity or race.The access accutni+3 reagent was not returned for evaluation.No hardware errors, flags or other assay issues were reported in conjunction with this event.A beckman coulter laboratory support specialist (lss) was dispatched to the customer site; the lss performed additional testing, including interference testing, on the sample.Lss testing of the neat sample produced an elevated result that confirmed the customer's result.Interference testing including alkaline phosphatase blockers was performed.Result recovery was significantly reduced using the alkaline phosphatase blocker.The presence of a patient-source interferent related to alkaline phosphatase was confirmed.In conclusion, the cause of this event is due to a confirmed patient-source interferent related to alkaline phosphatase.
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On (b)(6) 2020 the customer reported an elevated troponin i (access accutni+3) result of 1.62 ng/ml had been generated on the customer's access2 immunoassay instrument, part number 81600n and serial number (b)(4) for one patient.This result was beyond the customer's reference range of <0.04 ng/ml and discordant to the patient's clinical expectation.The customer then tested the patient's sample on a competitor device and obtained a result of 0.006 ng/ml.Reference range for competitor device was not provided.There was a report of change to patient care or treatment which occurred in connection with this event.The customer reported that due to the discordant results between the two platforms, the patient underwent a coronary angiography, the result of which did not show any blockages.No additional report of changes to patient treatment or outcome were reported.System performance indicators such as system check, calibration and quality control were passing within specifications at the time of the event.There was no report of sample integrity issues.Sample and sample processing information such as sample type, sample storage and handling conditions were not provided.
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