If the calibration or QC systems fail to meet acceptable criteria, suspend all operations until you identify the source or cause of failure is identified and corrected. If the source of failure is with the mass spectrometer or a pipetting error, correct the problem immediately. Otherwise, prepare fresh reagents and clean the mass
spectrometer system. Before beginning another analytical run, re-analyze several QC materials (in the case of QC failure) or calibration-verification samples (in the case of calibration failure). After re-establishing calibration or QC, resume analytical runs.