I took a home test yesterday with a 50 ng/ml, using my first pee of the day, and got a VERY faint test line (supposedly indicating a negative result). So, I'm freaked out because I'm thinking that means my concentration was under 50 ng/ml, but just barely.
Youre thinking incorrectly. There is no meaning attributed to the intensity or width of a line. Even synthetic urine controls (which contain NO drug metabolites at all) can produce a faint line on an assay. A faint line is still a line, which is a negative.

I have to take a test next week, and the place they want me to use is Legacy Metrolab in Portland. I've read some horror stories about this, mostly I think because they use the 20 ng/ml cut off instead of 50
The party who is paying for the U/A is the one who decides what the assay cutoff threshold should be - not the lab. The lab just provides the "test menu" for the client to pick and choose from.
Burnt Toast Reviewed by Burnt Toast on . Freaking out about urine test. Any advice? Hi everyone, I'm pretty freaked out about my upcoming urine test, so any advice or information would be greatly appreciated. I'm 30 years old, 5'10", and 160 lb. I'm thin, but I don't exercise much. On December 11, I got an eighth, probably shared about a quarter of it, and smoked pretty much every day until it was gone on January 5. I hadn't smoked for a few weeks before December 11. I have to take a test next week, and the place they want me to use is Legacy Metrolab in Portland. Rating: 5