Quote Originally Posted by Burnt Toast
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.
IT simply says tests orderd: 89710
10 PANEL