Quantitative measurement of Delta-9 Tetrahydrocannabinol and two major metabolites in physiological specimens using capillary column gas. chromatography/negative ion chemical ionization mass spectrometry.

Delta-9 THC and two of its metabolites can be measured in a single 1 ml. sample of blood, plasma, or urine by a new assay which combines a relatively rapid extraction procedure with capillary column gas chromatography and negative ion chemical ionization mass spectrometry.