The most sophisticated drug-testing approach is gas chromatography coupled with mass spectrometry (GC/MS), which is regarded as a "gold standard"; it is used in confirmatory testing. Typically, GC/MS is preceded by a rapid immunoassay method to eliminate the majority of the "negative" samples.
Simply so, what is the GC MS used for?
Gas chromatography–mass spectrometry (GC-MS) is an analytical method that combines the features of gas-chromatography and mass spectrometry to identify different substances within a test sample.
What does a GC MS measure?
A very powerful and sensitive instrument used to study trace amounts of chemicals in the air is a gas chromatograph (crow-MAT-oh-graf) connected to a mass spectrometer (spek-TRO-meh-ter), or GCMS. The GCMS can detect chemicals in amounts as small as a picogram.
What is a GC instrument?
Gas chromatography (GC) is a common type of chromatography used in analytical chemistry for separating and analyzing compounds that can be vaporized without decomposition. The gaseous compounds being analyzed interact with the walls of the column, which is coated with a stationary phase.