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Related Experiment Videos

Methodologic considerations in the interpretation of postmortem carboxyhemoglobin concentrations

B Levine1, J D'Nicuola, G Kunsman

  • 1Forensic Toxicology Laboratory, Armed Forces Institute of Pathology, Washington, DC 20306-6000, USA.

Toxicology
|December 31, 1996
PubMed
Summary

Accurate postmortem carboxyhemoglobin (COHb) measurement is crucial for legal cases. This study found that spectrophotometric methods can significantly overestimate COHb levels, especially with low hemoglobin, impacting fire death investigations.

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Area of Science:

  • Forensic Toxicology
  • Analytical Chemistry
  • Biochemistry

Background:

  • Postmortem carboxyhemoglobin (COHb) interpretation is vital in fire death investigations, even when COHb isn't the direct cause of death.
  • Litigation often depends on determining the duration of a victim's survival during a fire, making reliable COHb measurement critical.
  • The accuracy of analytical methods for measuring COHb, particularly at low to sub-lethal concentrations, is essential for correct interpretation.

Purpose of the Study:

  • To compare the reliability of a spectrophotometric method (IL 482 CO-Oximeter) against a reference gas chromatographic (GC) method for measuring postmortem COHb levels.
  • To evaluate the influence of varying total hemoglobin (Hb) concentrations on COHb measurements obtained by the spectrophotometric method.

Main Methods:

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  • Analyzed 40 blood specimens from fire deaths and 15 from non-fire deaths.
  • Compared COHb concentrations measured by a spectrophotometric method (CO-Ox) with a reference gas chromatographic (GC) method.
  • Performed saline dilutions to achieve low hemoglobin (Hb) levels (as low as 1g/dl) to assess method performance under various conditions.

    • Main Results:

    • Spectrophotometric COHb measurements showed significant overestimation compared to GC, with average ratios of 2.8 (Hb ≥ 4g/dl) and 8.0 (Hb < 4g/dl) at low COHb (<5%).
    • At higher COHb levels (5-40%), the spectrophotometric method still overestimated, with ratios of 1.6 (Hb ≥ 4g/dl) and 2.1 (Hb < 4g/dl).
    • The degree of overestimation by the spectrophotometric method was notably higher in specimens with lower total hemoglobin concentrations (Hb < 4g/dl).

    Conclusions:

    • Analytical methods significantly influence postmortem carboxyhemoglobin measurements.
    • Spectrophotometric methods, like the IL 482 CO-Oximeter, may not be reliable for accurate COHb quantification in postmortem samples, especially those with low hemoglobin.
    • These findings highlight the need for careful consideration of analytical methodology when interpreting postmortem COHb levels in forensic investigations.