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The investigation determined that a lower than expected vitros digoxin (dgxn) result was obtained from an institute for quality management in healthcare (iqmh) proficiency sample when processed using vitros dgxn microslides on a vitros xt7600 integrated system.A definitive assignable cause was not determined.A review of historical vitros dgxn quality control indicates acceptable performance, indicating that an issue with the vitros dgxn slide lot 1930-0267-3516 was not a likely contributor to the event.The customer did not process any within run precision testing at the time the proficiency testing was performed, therefore a transient issue with the vitros xt7600 system cannot be confirmed or ruled out as a contributor to the event.However, an instrument issue is not a likely contributor to the event as the customer was able to obtain an acceptable result using an alternate lot of vitros dgxn with no actions performed on the analyzer.The customer gave no indication that there were any issues with the reconstitution of the proficiency samples, and an acceptable result was obtained when repeat testing was performed using the same sample on the customers current in-use lot of vitros dgxn, therefore an issue with the proficiency sample is not a likely contributor to the event.
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