The niacin didn't help. They must be sending the sample off for confirmation with GC/MS. Thats why they knew what your levels are. You will probably be fairly clean in 3 weeks but you still might not be low enough to fall under the 15ng cutoff. If you try to do it naturally be sure and follow the dillution sticky the morning of the test. Your best bet though would be to sub with synthetic urine. Just ask mommy if you can borrow $20 to buy some synthetic urine.lol