The study checked prepared cannabinoid extracts in a refrigerated autosampler for 72 hours. That experiment did not establish long-term stability of unprocessed meconium or umbilical-cord tissue.
What was placed under study conditions
The authors evaluated extracted cannabinoids at several concentrations for each matrix. At 4°C in the autosampler for 72 hours, expected concentrations remained within 20% of target, with coefficients of variation below 20% under the reported acceptance criteria.
The tested material had already undergone preparation. Its chemical environment was different from an intact clinical specimen awaiting extraction.
Stability claims retain material, temperature and duration
A result from prepared extracts cannot automatically be applied to room-temperature transport, months of frozen tissue storage or repeated thawing. Those are separate conditions. Failure to test them here is not proof of degradation; it marks the boundary of what this particular experiment established.
Use the relevant laboratory evidence
When assessing a delayed neonatal cannabis result, identify whether the delay occurred before preparation or after extraction and which storage conditions were used. The autosampler check supports the reported analytical workflow. It does not independently validate every preanalytical interval or provide a concentration correction for an unknown storage history.
Related reading: interpreting cannabinoid assay validation.
Research cited
Jensen and colleagues (2019). Detection of in utero Exposure to Cannabis in Paired Umbilical Cord Tissue and Meconium by Liquid Chromatography-Tandem Mass Spectrometry. DOI: 10.1016/j.clinms.2019.01.002.
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