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In page N,N-Dimethyltryptamine:

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DMT may be measured in blood, plasma or urine using chromatographic techniques as a diagnostic tool in clinical poisoning situations or to aid in the medicolegal investigation of suspicious deaths. In general, blood or plasma DMT levels in recreational users of the drug are in the 10–30 μg/L range during the first several hours post-ingestion.[citation needed] Less than 0.1% of an oral dose is eliminated unchanged in the 24-hour urine of humans.[1][2]