A blood-like specimen obtained by blind needle puncture through the chest can contain gastric material and produce a misleading overdose interpretation. Logan and Lindholm documented this in a single case in which the original specimen and later autopsy specimens yielded markedly different ethanol and amitriptyline results. Cytology provided evidence of contamination that the concentrations alone could not establish.
How the first specimen was collected
The report concerned a 45-year-old woman found dead at home, with a history of cardiovascular disease and non-insulin-dependent diabetes. At the coroner’s request, funeral-home personnel collected a specimen by blind puncture through the chest wall. The exact vessel or cardiac chamber entered was not identified.
The submitted material was brown and largely immobile. Its container contained potassium oxalate and sodium fluoride, with fluoride reported as 0.25% weight/volume. The publication does not give a precise death-to-first-collection interval or a complete storage history. Those details should not be supplied by assumption.
The initial results were ethanol 0.22 g/100 mL, amitriptyline 6.16 mg/L and nortriptyline 0.35 mg/L. The authors initially considered that pattern consistent with combined drug and alcohol overdose. That interpretation depended on the specimen actually representing circulating blood.
Autopsy specimens changed the evidentiary picture
After family concerns, an autopsy was ordered four days later. The pathologist collected subclavian blood, vitreous humor and urine. Autopsy blood was red and mobile and arrived with the same reported preservatives. Examination identified four chest-wall needle punctures, suggesting multiple collection attempts.
Subclavian blood ethanol was 0.01 g/100 mL; vitreous ethanol was also 0.01 g/100 mL, and urine ethanol was 0.03 g/100 mL. Autopsy blood amitriptyline was 0.26 mg/L and nortriptyline 0.09 mg/L. The pathologic cause of death was reported as acute pancreatitis. The authors interpreted the later drug findings as therapeutic rather than supporting the initial overdose conclusion.
These were collections at different times and sites, not a controlled simultaneous comparison. The later values cannot independently establish an exact concentration during life. Their importance was the discrepancy combined with the specimen’s physical appearance, collection history and cytologic findings.
What established contamination?
Autopsy revealed gastric material in the respiratory tract and bile-stained material over the larynx, trachea and bronchi. Cytology of the original blind-stick specimen identified columnar cells, ciliated columnar cells, squamous cells and cooked meat fibers. The findings supported contamination from the stomach or gastric aspirate in the esophagus or respiratory tract.
This provides a different explanation from redistribution out of drug-containing tissues into blood. Aspirating material containing unabsorbed medication can create a high measured concentration without that concentration ever having circulated systemically. The report does not quantify how much contamination occurred or provide a correction formula.
Preservation did not establish the source of ethanol
The authors could not rule out formation of some or all of the detected ethanol in the gastric-contaminated specimen, despite the presence of sodium fluoride. They did not determine the relative contributions of predeath drinking, aspirated material and later formation.
The paper describes drug-screen findings and reports numerical concentrations, but does not provide a complete analytical validation, detection limits or precision study. It should not be represented as a modern validation of a confirmatory method. Its central evidence concerns specimen provenance and cytology.
What to recover when a result is questioned
Collection records should identify the anatomical source, technique, collector, timing, additives and specimen appearance. Large discrepancies may justify reviewing retained material and pathology rather than attributing everything to redistribution. This single case establishes a documented contamination mechanism, not its prevalence or proof that every blind-stick result is contaminated.
The related distinction between two identified vessels is addressed in subclavian versus femoral blood testing. Neither a site label nor a high drug number alone establishes impairment or cause of death.
Primary source
Logan BK, Lindholm G. Gastric Contamination of Postmortem Blood Samples During Blind-Stick Sample Collection. American Journal of Forensic Medicine and Pathology. 1996;17(2):109–111. doi:10.1097/00000433-199606000-00005.
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