Reported risk: Increased frequency of calibration failures for VITROS Immunodiagnostic Products NT-proBNP Reagent Lots 1568, 1570, 1580 and 1590, due to background signals for these affected NT-proBNP lots that have been increasing with time since release testing, resulting in higher than expected VITROS Immunodiagnostic Products NT-proBNP level 1 calibrator signals produced, leading to calibration failures.
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