Most initial screens carry a 50 ng cutoff threshold. The confirmation GC/MS is at 15 ng.

A lot of people dont realize it, but a 50 ng assay screen is functionally equivalent to the 15 ng GC/MS. For more information, do a Forum Search using the terms "functionally equivalent metabolites".

With that being pointed out, if you fail a GC/MS, you wouldve failed the assay screen as well.
Burnt Toast Reviewed by Burnt Toast on . Got MY GC/MS results back need an opinion or two.... Hey guys, hope everyone is doing well. Anyways last week (day 21 clean) i sent my first check testing kit to GC/MS for confirmation. I just got the results back today at 19ng/ml which was ruled a positive. It was my first void of the day and now i am freaking out because my real pre-employment test is on Friday (30 days clean). Do you think its possible i will be below cut-off level by day 30 seeing that at day 21 it was at 19ng/ml? I am 6ft 145pounds, used to be a heavy toker since i quit Rating: 5