• Allyson Kreshak, Janna Villano, Alexander Clark, Pamela Deak, Richard Clark, and Christine Miller.
• a Department of Emergency Medicine, University of California San Diego , San Diego , CA , USA.
• Am J Drug Alcohol Abuse. 2016 Mar 1; 42 (2): 178-86.

BackgroundPatterns of drug use during pregnancy may be changing. Identifying changes in pregnant women's drug use may help to target prevention and treatment.ObjectiveTo determine the regional prevalence of drug and alcohol use among pregnant women in Southern California.MethodsThis was a prospective, descriptive study conducted at a university health system's urban and suburban ambulatory obstetric offices. Included were pregnant women of all ages and trimesters. Excluded were non-pregnant women and women who had previously presented for an obstetric appointment during the data collection time period. Women provided a urine sample as part of routine care. Liquid chromatography-tandem mass spectrometry analysis of urine was performed for detection of a pre-selected sample of drugs and for alcohol. Descriptive statistics were performed.ResultsA total of 295 urine samples were included. All trimesters were represented. A total of 14.2% of urine samples were positive for at least one of the tested drugs or alcohol. Alcohol was detected in 6% of the urine samples and was the most frequently identified substance. Prescription opioid analgesics (3.7% detection rate) and marijuana (4% detection rate) were the other most frequently detected substances.ConclusionsCompared with older reports, our detection rates of prescription opioid analgesics were increased while rates of urinary alcohol detection were relatively unchanged, and detection rates of marijuana were decreased. Provider awareness of these substance detection rates may facilitate the identification of patients using these substances during pregnancy and ultimately help promote potential prevention and treatment.

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