selected reaction monitoring multiple reaction monitoring MRM This term should not be confused with consecutive reaction monitoring, which involves the serial application of three or more stages of selected reaction monitoring. [IUPAC] K. K. Murray, R. K. Boyd, M. N. Eberlin, G. J. Langley, L. Li and Y. Naito, Pure Appl. Chem., 2013, 85, 1515-1609 multiple reaction monitoring Multiple reaction monitoring is a selected reaction monitoring applied to multiple product ions from one or more precursor ions. [IUPAC]