For ethanol analysis, random urine samples can be collected with no preservative requirement. Although urine ethanol is suggested to be approximately 1.3 times higher than that in blood in the post-absorptive phase (11), urine alcohol concentration represents an average of blood alcohol concentration during the period in which urine gets collected in the bladder. Therefore, a representative urine sample can be collected by first emptying the bladder and then collecting the urine after 20-30 min. Urine alcohol testing may be performed in conjunction with urine testing for drugs of abuse.

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