The investigation determined that a failed calibration attempt of vitros ferritin reagent on the vitros eci analyzer occurred.The likely assignable cause of the unsuccessful calibration is contamination of the signal reagent (sr) in the reaction well.Residual dried signal reagent present on the outside of the sr probes can re-hydrate and alter the sr reaction causing suppressed light units within the well.After cleaning the sr dispense probes, an acceptable vitros ferritin calibration was obtained.User error regarding routine maintenance of cleaning the sr probe cannot be rule out as a contributing factor as no substantial evidence was presented indicating that maintenance was being performed.(b)(4).
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