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Comments: Distribution ratios of ethanol and water between whole blood, plasma, serum, and erythrocytes: Recommendations for interpreting clinical laboratory results in a legal context
Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för klinisk kemi och farmakologi. Linköpings universitet, Medicinska fakulteten.
Georgia Bur Invest, GA USA.
2023 (Engelska)Ingår i: Journal of Forensic Sciences, ISSN 0022-1198, E-ISSN 1556-4029, Vol. 68, nr 1, s. 9-21Artikel i tidskrift, Editorial material (Övrigt vetenskapligt) Published
Abstract [en]

This article reviews the scientific literature dealing with the distribution of ethanol and water between whole blood (WB), plasma, serum, and erythrocytes (red-blood cells). Knowledge of the ethanol distribution ratio is important when analytical results derived from hospital clinical laboratories are interpreted in a forensic context, such as during the prosecution of traffic offenders. Statutory blood-alcohol concentration (BAC) limits for driving are defined as the concentration of ethanol in WB and not in plasma, serum or red-blood cells. These bio-fluids differ in their water content and thereby the concentrations of ethanol. Plasma and serum contain similar to 90%-92% w/w water, WB similar to 78%-80% w/w and erythrocytes similar to 64%-66% w/w. The mean plasma/WB and serum/WB distribution ratios of ethanol are therefore expected to be similar to 1.15:1 (91/79 = 1.15), which is in good agreement with values determined empirically. However, in individual cases, the actual distribution ratio will depend on the persons age, gender, and biochemical and hematological properties of the blood specimen, such as its hematocrit. For legal purposes, we recommend that the concentration of ethanol in plasma or serum determined at hospital laboratories is divided by a factor of 1.2, which would provide a conservative estimate of the co-existing BAC and the chance of overestimating the true value is only 1 in 2000 (0.05%).

Ort, förlag, år, upplaga, sidor
WILEY , 2023. Vol. 68, nr 1, s. 9-21
Nyckelord [en]
alcohol; analysis; blood; ethanol; forensic labs; hematocrit; hospital labs; plasma; serum; toxicology
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URN: urn:nbn:se:liu:diva-189924DOI: 10.1111/1556-4029.15164ISI: 000877049800001PubMedID: 36317846Scopus ID: 2-s2.0-85141362700OAI: oai:DiVA.org:liu-189924DiVA, id: diva2:1710890
Tillgänglig från: 2022-11-15 Skapad: 2022-11-15 Senast uppdaterad: 2023-03-20

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