What if its a hospital that's doing the GC/ms testing and they don't have a cut off level?
ALL urine drug tests have some sort of cutoff level. Like I said earlier, if a sample registers below that cutoff level, its ruled a negative - plain sweet and simple - on to the next urine specimen..

They are not going to worry about quantitative values on negative samples, so why should you?
Burnt Toast Reviewed by Burnt Toast on . how does gc/ms thc testing work If the cut off for GC/ms testing is 15ng/ml, then if I'm at 10 ng/ml will they be able to see I'm at 10ng/ml But because its below the cutoff line I'll pass, or they just won't see it at all? Rating: 5