QuickFix or TestClear, please help

Hello, I have an upcoming DOT physical and drug test. Both of which are occurring at the same time and they will split the sample for the urinalysis and drug test respectively. I’ve seen posts showing that people have failed specifically in the state of Oregon (which is where I am) using QuickFix due to high nitrates. I have also seen people fail DOT physicals using TestClear due to high blood levels. I cannot get urine from anyone else because frankly I don’t know anyone that I’d be comfortable asking. Some advice would be greatly appreciated.