Quote Originally Posted by killerweed420
"INTERPRETATION: THC (Marijuana) Metabolite Drugs are screened by immunoassay.

Positive results are confirmed by a second method. The following threshold concentrations are used for this analysis:

DRUG SCREENING THRESHOLD marijuana metabolite 20 ng/ml

It appears that for the GC/MS test they will test at these levels. For the standard immunassay test the cutoff should be 50.
here is their website. i will call tomorrow and ask what that means. i looked at the other panels, and tried to compare if the thresholds are for the second test, or the 'drug screen' by immunoassy. hard time telling.

MEDTOX : Test Catalog