Drug test confirmation cutoff. But, in some cases, an immunoassay drug test might also require a confirmation test. The routine cutoff levels listed below may periodically change. The first is a screening cut-off to detect if a sample is positive, with the second being a confirmation cut-off for the second test performed on a specimen to confirm the test results. For example, immunoassay drug tests screen for the type of substance used above a certain cutoff level, but can't identify which specific substance has been used. The cutoff levels of an immunoassay screen are typically higher than those of a more sensitive GC/MS or LC/MS/MS confirm test, because they screen for a larger group of parent compounds, metabolites and other structurally similar compounds. Apr 27, 2020 · If the specimen tested goes above this predetermined cutoff level for a drug class or panel, the specimen fails the screening process and moves on to the confirmation or laboratory testing process. Drug testing cutoff levels are measured in nano-grams per milliliter (ng/ml). Jun 15, 2021 · Drug testing detects the presence of drugs and drug metabolites using cutoff levels to determine whether a specimen tests positive or negative for the use of a specific drug. Drug test screening level vs. Jun 18, 2021 · Drug testing can detect the presence of drugs and drug metabolites by using cutoff levels to determine if a specimen tests positive or negative for use of specific types of drugs. xjin dhyl0 izb8g 7z3 7cgt v5hy8 escqp 3wja cxdvgj 00d