what is a gc screen
Q: What is GC/MS? A: GC/MS is the abbreviation for gas chromatography/mass spectrometry, the testing methodology LabCorp uses to confirm presumptive positive drug screen specimens. GC/MS provides identification of the molecule(s) based on characteristic fragmentation patterns at specific retention times. GC/MS is a tandem technology, utilizing a gas chromatograph coupled to a mass spectrometer. Q: Why are screening and confirmation cut-off levels different? A: Simply stated, screening and confirmation testing are performed using different testing methodologies that precipitate different cut-off levels.