Plasma and Weed

I have a question, hopefully somebody will give me some insite on it....
I quit smoking 27 days ago, knowing i would have to take a UA for a new job. I know THC can stay in your system for up to 11 weeks. Although I've passed UA's before with little or no problem, However I have donated plasma twice in the last week, and this time i was informed that they had to sent my UA to a lab after in-house testing. I was wondering if anyone knew when the body regenerates plasma, would it help or hinder a UA test?

I would say the plasma donations helped to get rid of a slight amount of THC metabolites but not enough to really matter because the main store of the THC metabolites is fatty tissue. That is the only factor I see.

Did they do a dipstick test then decide to send it to the lab?

Yes they did. I'm hoping, since i was partially dehydrated when i took the UA, that maybe the levels (creatine n such) or something simple like the color threw it off.