Have drug testing questions? Get answers from Experts
Because all these drugs (Morphine, Oxycontin & Hydrocodone) are types of opiates, there can be False-positive screens are the result of cross-reactivity to the antibody in EIA (ELISA based IMMUNOASSAYS)
This is something that will usually be corrected when the GC/MS test is done.
Talk to your treating doctor regarding the same, ask them to do a confirmatory GC/MS test, and the actual drug will be confirmed,