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A 36-year-old member asked:

Why would a narcotic drug test (both urine and blood) come back negative when the person is taking the prescribed narcotics?

2 doctor answers4 doctors weighed in
Dr. Tarek Shahbandar
Anesthesiology 22 years experience
Sensitivity: Depends on sensitivity of test. Also, some opioids like hydrocodone need gas chromatography to be detected sometimes.
Dr. Stuart Wasser
Addiction Medicine 35 years experience
See below: A common error occurs when a patient is prescribed an oxycodone preparation and they are tested for opioids only. The opioid test in urine will not test positive when a patient is on oxycodone or many other synthetics or semi-synthetic agents.

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Last updated May 1, 2016
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