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Differences in sampling techniques on total post-mortem tryptase.

R Tse¹, J Garland², K Kesha³

¹Department of Forensic Pathology, LabPLUS, Auckland City Hospital, Auckland, 1148, New Zealand. rexson.tse@gmail.com.

International Journal of Legal Medicine

|November 22, 2017

Summary

This summary is machine-generated.

Post-mortem tryptase levels in femoral blood differ significantly based on collection technique. Aspiration yielded lower levels than femoral vein cut-down, highlighting the need to document sampling methods for accurate anaphylaxis diagnosis.

Keywords:

Anaphylaxis Post-mortem Sampling Tryptase

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Area of Science:

Forensic Pathology
Clinical Chemistry
Toxicology

Background:

Mast cell tryptase measurement aids in diagnosing anaphylaxis.
Post-mortem blood sampling for tryptase typically uses peripheral sites like femoral blood.
Current literature lacks standardized sampling techniques for post-mortem femoral blood, leading to variability.

Purpose of the Study:

To compare post-mortem femoral blood tryptase levels obtained via two distinct sampling methods.
To investigate potential differences in tryptase measurements influenced by collection technique.

Main Methods:

A retrospective study analyzed 17 cases over 6 months.
Compared femoral total post-mortem tryptase levels using needle aspiration versus femoral vein cut-down during evisceration.

Main Results:

A statistically significant difference was found between the two methods (p < 0.05).
Mean tryptase levels were 10.87 ug/L by aspiration and 14.15 ug/L by cut-down.
The mean difference was 3.28 ug/L, with a 95% confidence interval of 0.001-6.564 ug/L.

Conclusions:

Femoral total post-mortem tryptase levels show a significant, though small, difference between aspiration and cut-down methods.
The clinical relevance of this difference and its contributing factors require further investigation.
Pathologists should document the precise blood collection method and site, and analyze samples from different techniques separately.