Drug test screenings are done in two steps-initial and confirmatory. After a urine sample is collected from the individual being screened, a portion of it is processed through the initial, or immunoassay, step. This first step is essentially an initial screening method of the sample. If the initial screen comes back as negative, then no further testing or action is required, and the individual is noted as being negative for the presence of drugs. However, if the sample comes back as non-negative on the initial test, a separate portion of the original sample is put through the confirmatory, or gas chromatography-mass spectrometry (GC-MS), test. This is a more specific test that is used to identify the individual substances or metabolites, as well as the amount of the substance, in the sample. Prior to noting an individual for having a positive drug test result, a confirmatory test should be done to rule out a false positive from the initial test. If you have any questions or need drug testing services, then we encourage you to contact our team of healthcare professionals at Walking Urgent Care. We are open 7 days a week and we accept walk-ins. We are located at 10308 W Sample Rd, Coral Springs, FL 33065. We serve patients from Coral Springs FL, Margate FL, Tamarac FL, Coconut Creek FL, North Lauderdale FL, Parkland FL, and surrounding areas.