Quote Originally Posted by Brookie
I hear what you are saying... I asked the guy, he told me the company has chose to do it this way.. I called my friend who works for the same employer, and said they administer the same test? As the instant.. For some reason I do not feel this confident.. or they test the urine the same way? and do they test the same levels?
An initial assay screen is performed first, usually with a cutoff threshold of 50 ng. But a client (employer) can opt for an assay screen with a threshold as low as 20 ng.
Do you have a copy of your COC form (you should)? It would state the type of urine test being performed in the form of a test code.

A typical test code would read something like this:

SAP 5-50 w/NIT

...which translates into Substance Abuse Panel (screen), Five types of drugs to be screened, with a 50 ng cutoff threshold for THC. The 'NIT' code means that they will be performing a validity test which includes checking for excessive nitrites. However, validity checks had become lab SOP in recent years, making the indication of the 'NIT' code less and less necessary.