Selected Reaction Monitoring

**Semantic type:** Conceptual Entity

**Definition:** A method for collecting tandem mass spectrometry data where an ion of a particular mass is selected in the first stage and a fragmented ion product is selected in the second mass spectrometer stage for detection. Selected reaction monitoring (SRM)-based experiments are generally performed in a triple quadrupole (QqQ) mass spectrometer.

**Synonyms:** - SRM