The 15ng means that the second confirmation must come in at 15ng or less for the test to be negative. You came in at 54ng. Now you see how close your were to passing the first confirmation that it would have never gone to the second confirmation if your first confirmation was 49ng or less.
slantedeyes Reviewed by slantedeyes 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