Blood alcohol analysis - Validation and determination of the measurement inaccuracy according to international standards

TL;DRAbstract

According to the ISO 17025 the method validation procedure corresponds to in-house aptitude testing. Testing the blood alcohol determination was performed using headspace gas chromatography and the ADH enzymatic method and data obtained from daily case study. Given the fact that there is no definition of a validation procedure mentioned in the German guidelines for blood alcohol determination, our validation was accomplished according to the guidelines for forensic-toxicological investigations as introduced by the GTFCh (Gesellschaft fur Toxikologische und Forensische Chemie). They were originally designated for gas chromatography and mass-spectrometry measurements. Our work shows that the GTFCh guidelines can be fulfilled after appropriate adaptation of individual validation parameters. However, with the current calibrators used at a pre-determined level of significance of 99%, the limit of determination (LOD) is 0,08 g/L for the GC-method and 0,3 g/L for the ADH- method respectively.

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