I took a drug test today at Quest Diagnostics (employment pre-screening). Prior to the test, I passed one first check home test and 8 thc testing strips, never failing one. I have not smoked marijuana in 24 days and prior to that, I was an infrequent smoker.

Does the standard Quest Diagnostics THC test use the 50 ng/ml cutoff? The job I was just offered is a white collar job for a relatively liberal organization. Just trying to find out what my chances are...

The cutoff should be 50 ng/mL the same as the OTC you have been using. It's reasonable to expect the same results particularly in view of your test repetition. All of the tests work on the same principle one is non-instrumental and Quest's is automated and therefore may stay a little closer to cutoff standard.