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Norco can be detected in the urine for 3-4 days. A blood test can identify Norco for up to 24 hours. A saliva test can detect Norco for up to 1-4 days. Norco, like many other drugs, can be detected with a hair follicle drug test for up to 90 days. Knowing how long Norco remains in the system and help prevent an accidental overdose by taking too much of the medication too soon.
Of course, if you had taken 15mg of oxycodone, it would be detected in the urine longer than when you took 5mg, but it could be 2-3 days before you turn negative on a urine drug screen. Ask Your Own Health Question. Customer: replied 7 years ago.