COMPUTER IMPLEMENTED METHOD FOR CALIBRATING A CUSTOMER MASS SPECTROMETRY INSTRUMENT FOR QUANTIFIER-QUALIFIER-RATIO CHECK

A computer implemented method for calibrating a customer mass spectrometry instrument (118) for quantifier-qualifier-ratio check is proposed. The method comprises the following steps:a) at least one manufacturer-site standardization, wherein a set of samples of a subject and a set of calibrator samples are measured in multiple replicates on a plurality of mass spectrometry instruments (114), wherein each measurement comprises multiple reaction monitoring with quantifier and qualifier transition for analyte and internal standard, wherein at least three adjustment factors are determined from the measurements of the set of samples of a subject and the set of calibrator samples, wherein a first adjustment factor α depends on a difference between analyte and internal standard, wherein a second adjustment factor β depends on a difference between samples of a subject and calibrator samples for analyte quantifier-qualifier-ratio, wherein a third adjustment factor γ depends on a difference between samples of a subject and calibrator samples for the internal standard quantifier-qualifier-ratio;b) at least one transfer step, wherein the adjustment factors are electronically transferred to a customer mass spectrometry instrument (118);c) at least one customer-site calibration, wherein the customer-site calibration comprises at least one calibration measurement, wherein a set of calibrator samples is measured on the customer mass spectrometry instrument (118) and quantifier-qualifier-ratios are determined therefrom, wherein target values for quantifier-qualifier-ratios for analyte and for internal standard are set by applying the adjustment factors on the determined quantifier-qualifier-ratios.