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Fig. 1.

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Fig. 1. (A) Assay of 11-nor-9-carboxy-Δ9-tetrahydrocannabinol using the original method, showing the analyte and IS with a retention time of 1.379 min and a near-co-eluting isobaric interferent right before the peak of interest (retention time of approximately 1.27 min) observed in all three analyte transitions. (B) The same patient sample assayed using the modified chromatographic separation (see Table 9) from the original extract (re-injection only).
Abbreviation: IS, internal standard.
Ann Lab Med 2022;42:531~557

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