RESUMEN
OBJECTIVE: The study objective was to compare rates of alcohol use between urine ethanol testing and self- reporting (Method: 1) and Phosphatidylethanol (PEth) dried blood spot testing and self-reporting (Method: 2). METHODS: This was a prospective observational study in an obstetric clinic with universal alcohol screening. RESULTS: Method: 1 identified 11 patients with alcohol use (5 urine and 6 self-reported); Method: 2 identified 28 (22 PEth and 6 self-reported) out of 315 patients (one patient positive for both urine and PEth). The six patients with self-reported use had negative urine and PEth testing. We had fair agreement between the two methods (282 negative and 7 positive; 289/314=92.0%; Kappa 0.32, p<0.001); method 2 identified significantly more women (McNemar, p<0.001). Combining methods: resulted in an alcohol detection rate of 10.2% (32/314). CONCLUSION: Method: 2 identified more alcohol users than Method: 1. Combining both methods: identified the most alcohol consumption.