The ALCAT Test is considered the «gold standard» in laboratory methods for identification of sensitivities to food and chemicals. (vitalizedbody.com)
The «roadside» results were then confirmed by using liquid chromatography - tandem mass spectrometry (a standard laboratory method used for marijuana testing) to analyze both the saliva and blood samples at different THC cutoff points ranging from 0.2 µg / L to 25 µg / L. (sciencedaily.com)