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[Carbohydrate deficient transferrin and ethyl glucuronide: markers for alcohol use].

In this article, we report on the usefulness of physicians testing for carbohydrate deficient transferrin (CDT) and ethyl glucuronide (EtG) when there are doubts about alcohol use by their patients. A 44-year-old male consulted his general practitioner with depressive symptoms and denied using alcohol. Laboratory examination revealed an elevated CDT value. The latter was caused by chronic alcohol use. The second patient, a 32-year-old female with known alcohol dependence and receiving inpatient treatment at an addiction clinic, came back from leave. She denied having consumed alcohol and her blood alcohol concentration was zero. Examination of her urine showed an elevated EtG/creatinine ratio. This was caused by having had a few drinks during her leave and could not have been caused by using mouthwash or disinfection soap. We describe how to use the results of CDT and EtG testing in the therapeutic process and give recommendations for patient communication before performing these two tests.