If your first sample tests above 50ng, the lab confirms the positive test with another, more sensitive test. If that test comes back below 15ng, the presumption is the first positve result was erroneous.

And I'm with you, no need for lectures. And intrusive tests that change your life are not funny. People come here for support and advice. Let's try to keep that in mind.
kermitthehermit Reviewed by kermitthehermit on . Urine Test Confirm Cutoff/Error Question Knew a test was coming so abstained for 10 days & drank water like crazy. Picked up two home tests from local drug store & both home tests said I passed (negative result). Submitted to official medical test and came up positive by 4ng/mL: Screening Cutoff = 50 ng/mL Confirm Cutoff = 15 ng/mL Confirm Quantity = 54 ng/mL If the confirm cutoff is 15ng, shouldn't a positive need to be at least 65ng (50+15)? Isn't the 15ng the error threshold? If not, what is "confirm cutoff" ? Rating: 5