Im quite new here aswell, but I figured I'd share my one gem of knowledge
I actually had both a urine and blood test done, the urine was sent to the "supper accurate" machine in the labs that takes a while to get back. I was really freaking out about the blood test, those are alot more accurate than the urine ones...
So I assume you passed the blood test then as we'll?? I'm facing similar situation, I will have about 3 weeks clean when I have to test, urine and blood.