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Cytochrome P450 2B6 (CYP2B6) is responsible for the initial biotransformation of profol, an extensively metabolized intravenous anesthetic. In this study we examined the effect of the apparently functional CYP2B6 c.516G > T polymorphism on the distribution of propofol concentrations, quantified by GC/MS analysis following a single bolus dose, in the blood of 44 Greek women undergoing oocyte retrieval. Univariate analysis using age, height, weight and smoking status as covariates, as well as the Mann-Whitney non-parametric test, revealed a strong trend of association of the T allele with high propofol concentrations determined in whole blood, shortly after a single bolus dose. Propofol concentrations which were higher than one standard deviation of the mean were almost invariably associated with carriage of the T allele.