In the SAMHSA 5-drug immunoassay panel, what is the typical cutoff concentration for THC in urine?

In the SAMHSA 5-drug immunoassay panel, what is the typical cutoff concentration for THC in urine?

• A. 50 ng/mL
• B. 25 ng/mL
• C. 100 ng/mL
• D. 150 ng/mL

Answer: (A)

The main idea being tested is how urine drug tests decide if a result is positive for cannabinoids in the SAMHSA 5-drug panel. In this panel, the initial immunoassay screen looks for the cannabinoid metabolite THCCOOH in urine and uses a predefined cutoff concentration to determine positivity. That cutoff is 50 ng/mL. If the THCCOOH level is at or above 50 ng/mL, the screen is considered positive and a confirmatory test (like GC-MS or LC-MS/MS) is performed to verify the result. This 50 ng/mL value is chosen to balance catching true positives with minimizing false positives from incidental exposure. The other values are not the standard SAMHSA screen cutoff, and the confirmatory step uses its own more specific criteria.