Two discordant, falsely low von willebrand factor activity (vwf ac) results were obtained on a patient sample on a bcs xp system (serial number: (b)(4)) with bc von willebrand reagent (lot 557470).The patient sample was previously frozen prior to the initial discordant results being obtained.The discordant results were reported to the physician(s) and were questioned.The same sample was also run for von willebrand factor antigen (vwf ag) and factor viii on the same day.These results were also reported to the physician(s) and it is unknown if they were considered discordant.The sample was re-frozen and was rerun twice for vwf ac seven days later, recovering higher.These repeat results were reported, as the correct results, to the physician(s).There are no reports of patient intervention or adverse health consequences due to the discordant, falsely low von willebrand factor activity (vwf ac) results.
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