There is no meaning attributed to the intensity of a line. Even synthetic urines (which contain no drug metabolites at all) can register a faint line on an assay.

The GC/MS is only used to confirm positives that have occurred on the intial assay screen. It would be too costly for both the lab and the client to use the GC/MS as the primary analysis.

Dont let the lower cutoff of the GC/MS worry you. A 50 ng assay is functionally equivalent to the 15 ng GC/MS. Their cutoffs numerically differ is because the assay recognizes all 31 metabolite concentrations combined, while the GC/MS only recognizes one metabolite concentration (THC-COOH).

In order to test negative on the assay, the whole combination of the 31 metabolite concentrations must register below 50 ng.
In order to test negative on the GC/MS, only that one metabolite concentration, THC-COOH, must register below 15 ng.
Burnt Toast Reviewed by Burnt Toast on . drug test in a few days going nuts! please help Hi I smoked a few joints very weak ones about 30 days ago I am having an upcoming drugtest and not sure how it will workout since I dont know what their cutoff usually is? I am told this is a very pro lab that does the work. I tested myself 2 weeks ago with 50ng cutoff test and it was negative and 1 week ago with 25ng cutoff diptest also negative but in both case the test line was pretty faint compared to control line. anyway what do you guys think my chances of passing are? also does Rating: 5