Thc levels 50 to 15

I just took a 50 ng home drug test and passed with my first void of the day. It was a little faint but definatley there. I was clean for 2 weeks. My question is do you think Ill be below 15 ng in another 2 weeks? Im very skinny and I run and do sit up everyday, weightlift every other day. I eat very healthy (low fat and sugar). I also eat a bunch of high fiber cereal every night. At this rate will I be good for a gc/ms 15 ng test in another 2 weeks? Dilution and subing isnt an option, I have to actually be clean.

Oh yeah and my smoking history was on and off for about 2 years. I was smoking pretty frequently and then quit for 9 days, then started again for 4 days before quitting for this test. 6'2.5 165 lbs if thats helps at all

Youre worrying yourself over nothing.

If youre passing your home tests with the first void of the day, you'll pass the actual U/A. They wouldnt run the GC/MS on the sample once it passes the initial screen anyway. Its a waste of the labs time and the clients money.

But even if for shits & giggles they do run the confirmation GC/MS, the sample would still test negative. Thats because a 15ng GC/MS is functionally equivalent to the 50ng Immunoassay screen. The cutoff levels are numerically different because the Immunoassay recognizes the composite of all 31 THC metabolite concentrations, while the GC/MS only recognizes one metabolite concentration: THC-COOH.
To pass the Immunoassay, the whole composite must test below 50ng.
To pass the GC/MS, only that one metabolite concentration (THC-COOH) must register below 15ng. The cutoff has to be set at a lower number to make the two types of tests functionally equivalent.