Weblabcorp performs initial drug screening using immunoassay. An immunoassay is a test that uses antibodies to detect the presence of drugs and other substances in urine. The initial screening process does not measure the specific amount of drug present in urine. Webinitial presumptive testing by immunoassay at the following testing thresholds: Webhow do i access my lab test results? What are the hours of operation at my local labcorp patient service center? How soon can i expect to receive my lab test results? Webaug 8, 2024 · labcorp ondemand offers…