Using bone marrow matrix to analyze meprobamate for forensic toxicological purposes.

Area of Science:

• Forensic Toxicology
• Postmortem Investigations
• Analytical Chemistry

Background:

• Bone marrow (BM) analysis is crucial in forensic toxicology when blood samples are compromised.
• Interpreting xenobiotic concentrations in BM is challenging due to limited research.
• Meprobamate is a common drug requiring accurate postmortem concentration interpretation.

Purpose of the Study:

• To develop and validate a diagnostic test for interpreting meprobamate concentrations in bone marrow.
• To establish a statistically equivalent threshold for BM meprobamate concentrations compared to blood.
• To assess the utility of BM as an alternative matrix in postmortem toxicology.

Main Methods:

• Analysis of 99 autopsy cases with available bone marrow and blood samples.
• Application of a statistical approach to determine BM concentration thresholds.
• Calculation of diagnostic test performance metrics (sensitivity, specificity).

Main Results:

• A bone marrow meprobamate concentration threshold of 11.3 μg/g was established.
• This BM threshold is statistically equivalent to a blood concentration of 50 μg/ml for distinguishing overdose.
• The diagnostic test demonstrated good performance with 0.82 sensitivity and 0.92 specificity.

Conclusions:

• Bone marrow is a valuable alternative matrix for detecting meprobamate overdose in postmortem toxicology.
• The developed BM diagnostic test provides reliable interpretation of meprobamate concentrations.
• This method is particularly useful when blood, vitreous humor, or bile samples are unavailable or unusable.