A patient sample was run for activated partial thromboplastin time (aptt) on an atellica coag 360 system (serial number: (b)(4)) with pathromtin sl reagent (lot number: 536709d) and was then repeated for aptt on a second atellica coag 360 system (serial number: (b)(4)) with pathromtin sl reagent (lot number: 536709d), resulting lower.The sample was then repeated again for aptt on the first atellica coag 360 system (serial number: (b)(4)), resulting higher and matching the initial result obtained on that system.The sample was then repeated again for aptt on the second atellica coag 360 system (serial number: (b)(4)), resulting lower.None of the results were reported to the physician(s).It is unknown which aptt results are correct.A new sample from the same patient was then run for aptt several times on three atellica coag 360 systems (serial numbers: (b)(4)), resulting lower than the original results obtained on atellica coag 360 system (serial number: (b)(4)) and higher than the original results obtained on atellica coag 360 system (serial number: (b)(4)).It is unknown if these results are considered correct or if they were reported to the physician(s).There are no reports of patient intervention or adverse health consequences due to the discordant activated partial thromboplastin time results.
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