Urine thebaine determination by liquid chromatography tandem mass spectrometry after poppy seed consumption.

Laboratories are challenged to distinguish whether a positive urine morphine result is due to heroin use or possible poppy seed consumption. Thebaine is an opium alkaloid that has been shown to be present in the urine of individuals who have consumed poppy seeds, as well as those who have used opium. It is not present in heroin.

Carfentanil Use in a Patient Undergoing Treatment for Substance Use Disorder.

Carfentanil is a synthetic opioid approximately 10,000 times as powerful as morphine. It is not approved for human use. However, cases of death associated with carfentanil have become more frequent in recent years.