The investigation determined that a lower than expected vitros na+ (sodium) result was obtained from a non-vitros (biorad) quality control (qc) fluid when run on a vitros 350 chemistry system.The assignable cause is related to a sub-optimal calibration due to calibrator fluids not being reconstituted correctly.Since the re-calibration using the same lot of reagent, calibrator fluids, and erf resolved the issue, a reagent issue is not likely to be a contributing factor.Although a within run precision test to verify the instrument was not completed, there is no indication of an instrument malfunction.
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