50 ng/ml of thc is required for urine to typically test positive in the us.
50 ng/ml of thc is required for urine to typically test positive in the us.
how many ng/ml of thc for urine to typically test positive in the us?
50
under the typical 50 ng/ml cutoff for thc in the united states, an occasional or on-off user would be very unlikely to test positive beyond 3–4 days since the last use, and a chronic user would be unlikely to test positive much beyond 7 days. using a more sensitive cutoff of 20 ng/ml (less common but still used by some labs), the most likely maximum times are 7 days and 21 days, respectively. in extraordinary circumstances of extended marijuana use, detection times of more than 30 days are possible in some individuals at the 20 ng/ml cutoff.
cannabis drug testing
the drugwipe device identified 1 exposed driver, but with gc-ms, 18 drivers tested positive. thc concentrations in the intercept buffer ranged from 2.1 to 205.1 ng/ml. these concentrations represent about 1/2 to 1/3 the authentic thc concentrations in oral fluid because of the dilution by the blue liquid of the device. two main limitations of oral fluid were 1. the amount of matrix collected is smaller when compared to urine and 2. the levels of drugs in urine are higher than in oral fluid. a current limitation of the use of this specimen for roadside testing is the absence of a suitable immunoassay that detects the parent compound in sufficiently low concentrations."
drugwipe test