ArticleDrug testing and analysis2019
Correlation of creatinine- and specific gravity-normalized free and glucuronidated urine cannabinoid concentrations following smoked, vaporized, and oral cannabis in frequent and occasional cannabis users.
Article in Drug testing and analysis, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
13 citing papers in PubMed, 20 citations in OpenAlex.
- N-acetylcysteine for youth cannabis use disorder: randomized controlled trial main findings.Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology · 2025Trial
- Urinary Excretion Profile of Cannabinoid Analytes Following Acute Administration of Oral and Vaporized Cannabis in Infrequent Cannabis Users.Journal of analytical toxicology · 2022Trial
- Cannabinoid profiling across toxicology samples in adolescents and young adults by route of administration and in relation to depression symptoms.Journal of analytical toxicology · 2025Article
- 11-Nor-9-Carboxy-Δ8-Tetrahydrocannabinol, 7-Carboxy Cannabidiol, and 11-Nor-9-Carboxy-Δ9-Tetrahydrocannabinol in Urine by LC-MS/MS.Methods in molecular biology (Clifton, N.J.) · 2024Article
- ΔCardiovascular toxicology · 2023Article
- The minor cannabinoid cannabigerol (CBG) is a highly specific blood biomarker of recent cannabis smoking.Clinical toxicology (Philadelphia, Pa.) · 2023Observational
- Implementation of Mathematical Models to Predict New Cannabis Use by Urine Drug Testing: It Is Time to Move Forward.Journal of analytical toxicology · 2021Article
- Preliminary Evidence for Cannabis and Nicotine Urinary Metabolites as Predictors of Verbal Memory Performance and Learning Among Young Adults.Journal of the International Neuropsychological Society : JINS · 2021Article
- Erratum To: Implementation of a Blind Quality Control Program in Blood Alcohol Analysis.Journal of analytical toxicology · 2021Article
- Free and Glucuronide Urine Cannabinoids after Controlled Smoked, Vaporized and Oral Cannabis Administration in Frequent and Occasional Cannabis Users.Journal of analytical toxicology · 2020Article
- Occupational Exposure to Secondhand Cannabis Smoke Among Law Enforcement Officers Providing Security at Outdoor Concert Events.Annals of work exposures and health · 2020Article
- A review of strategies for untargeted urinary metabolomic analysis using gas chromatography-mass spectrometry.Metabolomics : Official journal of the Metabolomic Society · 2020Review
- Urinary Excretion Profile of 11-Nor-9-Carboxy-Δ9-Tetrahydrocannabinol (THCCOOH) Following Smoked and Vaporized Cannabis Administration in Infrequent Cannabis Users.Journal of analytical toxicology · 2020Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors at 5 institutions in 2 countries.
Funding
Abstract
Variability in urine dilution complicates urine cannabinoid test interpretation. Normalizing urine cannabinoid concentrations to specific gravity (SG) or creatinine was proposed to account for donors' hydration states. In this study, all urine voids were individually collected from eight frequent and eight occasional cannabis users for up to 85 hours after each received on separate occasions 50.6 mg Δ9-tetrahydrocannabinol (THC) by smoking, vaporization, and oral ingestion in a randomized, within-subject, double-blind, double-dummy, placebo-controlled protocol. Each urine void was analyzed for 11 cannabinoids and phase I and II metabolites by liquid chromatography-tandem mass spectrometry (LC-MS/MS), SG, and creatinine. Normalized urine concentrations were log
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What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.