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Site dependence of postmortem blood methadone concentrations
1Office of the Chief Medical Examiner, State of Maryland, Baltimore 21201-1020, USA.
Summary
Discrepant methadone blood concentrations were observed in forensic cases. A study of 15 cases revealed significant variability between heart and subclavian blood methadone levels, impacting toxicological analysis.
Area of Science:
- Forensic Toxicology
- Analytical Chemistry
Background:
- Accurate quantification of methadone is crucial in postmortem toxicology.
- Discrepancies in blood sample analysis can affect interpretation of drug levels.
Observation:
- A specific case presented significantly different methadone concentrations in heart blood (2.4 mg/L) versus subclavian blood (0.8 mg/L).
- This prompted an investigation into methadone concentration variability in other postmortem cases.
Findings:
- Only 4 out of 15 cases showed heart and alternate blood methadone concentrations within a 20% range.
- Over 47% of cases exhibited variations greater than 60%.
- No consistent trend of higher or lower concentrations at a specific blood site was identified.
Implications:
- Significant variability in methadone blood concentrations between sampling sites can complicate toxicological interpretation.
- These findings highlight the need for careful consideration of blood sampling site in methadone analysis.
- Further research may be needed to establish best practices for methadone blood sample collection and analysis in forensic investigations.