Evidence of fentanyl use is common and frequently missed in a cross-sectional study of emergency department patients in Baltimore, Maryland.

Fentanyl-associated deaths have risen in Maryland, but the prevalence of illicit fentanyl use is unknown. Our objective was to measure whether fentanyl is present among emergency department (ED) patients seeking care for a drug overdose. The prevalence of fentanyl use was determined using a cross-sectional study of a convenience sample of adult ED patients with complaints of apparent opioid overdose, withdrawal from opioids, and/or requesting treatment for their substance use disorder (SUD) between February and April, 2018. Subjects were consented, interviewed, and underwent urine point-of-care (POC) fentanyl testing. A total of 102 patients met inclusion criteria and were approached, 76 consented, 63 (83%) of whom tested positive for recent fentanyl use. 60 (80%) were male, 26 (34%) had overdosed, 41 (54%) were seeking SUD treatment, and 13 (17%) were in withdrawal (4 had multiple complaints). Of those who underwent both standard hospital urine drug screen and POC fentanyl testing, 56% (22/39) were positive for fentanyl and negative for opiates. Only 5% (4/76) reported knowledge of using fentanyl. Fentanyl use was common and frequently missed among these ED patients. Hospitals who treat patients taking illicit fentanyl should consider adding fentanyl to their urine drugs of abuse panel.