Result types
Positive Drug Test ResultA positive screen is presumptive, not final. It is only reported as positive aft…Negative Drug Test ResultA negative result means the drug or metabolite was below the test cutoff at the …Dilute, Invalid & Adulterated ResultsA dilute or invalid specimen is not a positive or a negative. Laboratories check…Medical Review Officer (MRO) ReviewAn MRO is a licensed physician who reviews non-negative results, contacts the do…
How a result is reached
A sample is screened by immunoassay, any non-negative screen is confirmed by GC-MS or LC-MS/MS, and a Medical Review Officer reviews non-negative results before they are reported. See test types and the detection chart for context.