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The investigation determined that lower than expected vitros ipth2 results have occurred with multiple patient samples when comparing data from a method comparison study between the vitros ipth2 assay and the vitros ipth assay on three different vitros xt 7600 integrated systems.A definitive assignable cause could not be determined.There is no indication the vitros ipth2 reagent in use at the time of the event was not performing as intended as vitros quality control fluids processed within the timeframe of the correlation testing were predicting as expected and no issues regarding accuracy or precision of the vitros assay were indicated by the customer.Additionally, precision testing of the vitros xt 7600 integrated systems was not performed, therefore, no assessment of the instrument's performance at the time of the event was made.However, the customer gave no indication of any vitros xt 7600 system malfunction and patient sample results were concordant between the three vitros xt 7600 systems.Therefore, an instrument issue is not a likely contributor to the event.Continual tracking and trending of complaints has not identified any signals that would indicate a potential systematic issue with vitros ipth2 reagent lot 0050.
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