The Cannabinoid Storage Baseline Already Included Up to a Day of Handling
The storage study compared later results with baseline aliquots analyzed within twenty-four hours. That baseline was an early laboratory measurement, not a direct measurement at the instant the blood left the participant.
How the pools were prepared
After controlled smoking, samples collected during the first hour formed high-THC pools, and samples from two to four hours formed low-THC pools for each participant. Aliquots were stored under assigned temperature conditions. Triplicate baseline aliquots were analyzed within twenty-four hours, while later time points used separately stored aliquots.
The starting reference has a defined interval
A later percentage change is relative to the measured baseline under that procedure. The experiment cannot quantify every possible change before the baseline analysis. The report also documented some baseline differences between storage conditions, emphasizing why a single assumed starting concentration is not a substitute for the actual measured reference.
What an original-concentration claim needs
The study is valuable evidence about subsequent stability in authentic specimens. It does not provide a complete reconstruction of a concentration at collection or authorize back-calculation through an undocumented first day. Review collection, plasma separation, pooling, temperature and initial analysis times before applying a stability percentage. Laboratory changes after collection must remain distinct from the person’s absorption, elimination and functional effects.
Related analysis: free metabolite changes during specimen storage.
Research cited
Scheidweiler and colleagues (2013). In Vitro Stability of Free and Glucuronidated Cannabinoids in Blood and Plasma Following Controlled Smoked Cannabis. DOI: 10.1373/clinchem.2012.201467.
