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The GHB concentration in majority of the blood samples (95%) was ≤ 50 mg/L, while in 81% it ranged from 10-50 mg/L. In 95% of the urine samples, the GHB concentration ranged from 10-20 mg/L while 82% of the samples had a concentration of 500 mg/L. The proposed published GHB concentration of 50 mg/L may be used as a cut-off to distinguish between natural endogenous concentrations and exogenous use, but this is not sufficient by itself. The detected GHB concentrations, both in vivo and in postmortem samples, require careful interpretation, not only due to its endogenous nature, but also due to the possibility of postmortem production and also due to its rapid metabolism and excretion.In order to distinguish the endogenous GHB concentration from those reflecting abusive GHB levels, defining a specific cut-off value in biological samples is very crucial. Other matrices, such as vitreous humour, femoral blood and hair must also be considered when interpreting postmortem GHB concentrations.

Study of Gamma-Hydroxybutyric Acid (GHB) Concentrations in Postmortem Blood and Urine