Hello from JustAnswer.
This test does not directly look for the hydrocodone in the Norco, but it is a bit more complicated. The test does include a screening test for opiates. However, the screening test for opiates is designed to detect morphine and those drugs that are metabolized into morphine, such as codeine and heroin. The hydrocodone is a semisynthetic opioid and is not metabolized into morphine, so will typically not be detected by the opiate screening test.
However, there is a small chance of cross-reactivity, particularly when there are higher concentration of the hydrocodone. So, while the screening test typically will not detect the hydrocodone, there is a small chance that the hydrocodone can cause a positive result.
If the urine is sent for confirmatory testing, such as a GC/MS, the confirmatory test will readily detect any of the prescription opioids, including the hydrocodone.
If you do have a positive test, then you should answer questions honestly about the prescription that you have, including why the medicine is prescribed and how you are taking it.
If I can provide any additional information, please let me know.