Validity testing of the accu pinch tm thc test

Amanda J. Jenkins, William D. Darwin, Marilyn A. Huestis, Edward J. Cone, John M. Mitchell

Research output: Contribution to journalArticle

Abstract

Self-contained drug-testing kits are currently being marketed for a variety of drugs of abuse. These tests are designed to provide rapid access to test results without the need for laboratory facilities. This report describes a validity study of the accu PINCH TM THC test, a self-contained test for cannabinoids in urine. Three healthy male volunteers with a history of marijuana use participated in the clinical study. Each subject smoked one, two, or four marijuana cigarettes (2.6% THC) on each test day. Urine samples were collected and incorporated into a specimen set consisting of 178 clinical samples, 72 urine samples containing known amounts of drug, and 50 drug-free urine samples. The specimen set was randomized and analyzed under blind conditions by the accuPINCH test and by gas chromatography-mass spectrometry (GC-MS) for 11-nor-9-carboxy-Δ9-tetrahydrocannabinol (THCCOOH). AccuPINCH results were interpreted independently by three readers as positive at either two calibration points (positive A <100 ng/mL THCCOOH; positive B ≥ 100 ng/mL THCCOOH) or negative. Concordance analysis was performed by comparison of the accuPINCH results with GC-MS. In addition, the effects of changes in sample turbidity, temperature, and assay reading time on test outcome were assessed. For the clinical samples, positive B results were associated exclusively with THCCOOH concentrations greater than or equal to 15 ng/mL, whereas positive A and negative results were obtained at all concentrations. All drug-free urine samples were interpreted as either negative or positive A. The test demonstrated relatively low cross-reactivity with THC and other cannabinoids. AccuPINCH was highly sensitive to sample turbidity but relatively insensitive to changes in sample temperature. Reading times longer than the recommended 5 min resulted in an increase in positive results. Overall, the accuPINCH test was easy to perform and generally produced valid positive B readings. However, positive A and negative readings were not always confirmed by GC-MS.

Original languageEnglish (US)
Pages (from-to)5-12
Number of pages8
JournalJournal of Analytical Toxicology
Volume19
Issue number1
DOIs
StatePublished - 1995

Fingerprint

Dronabinol
Gas chromatography
Mass spectrometry
Urine
Turbidity
Reading
Cannabinoids
Gas Chromatography-Mass Spectrometry
Testing
Cannabis
urine
Pharmaceutical Preparations
drug
Assays
gas chromatography
Street Drugs
mass spectrometry
Temperature
Tobacco Products
Calibration

ASJC Scopus subject areas

  • Analytical Chemistry
  • Health, Toxicology and Mutagenesis
  • Environmental Chemistry
  • Chemical Health and Safety
  • Toxicology

Cite this

Jenkins, A. J., Darwin, W. D., Huestis, M. A., Cone, E. J., & Mitchell, J. M. (1995). Validity testing of the accu pinch tm thc test. Journal of Analytical Toxicology, 19(1), 5-12. https://doi.org/10.1093/jat/19.1.5

Validity testing of the accu pinch tm thc test. / Jenkins, Amanda J.; Darwin, William D.; Huestis, Marilyn A.; Cone, Edward J.; Mitchell, John M.

In: Journal of Analytical Toxicology, Vol. 19, No. 1, 1995, p. 5-12.

Research output: Contribution to journalArticle

Jenkins, AJ, Darwin, WD, Huestis, MA, Cone, EJ & Mitchell, JM 1995, 'Validity testing of the accu pinch tm thc test', Journal of Analytical Toxicology, vol. 19, no. 1, pp. 5-12. https://doi.org/10.1093/jat/19.1.5
Jenkins AJ, Darwin WD, Huestis MA, Cone EJ, Mitchell JM. Validity testing of the accu pinch tm thc test. Journal of Analytical Toxicology. 1995;19(1):5-12. https://doi.org/10.1093/jat/19.1.5
Jenkins, Amanda J. ; Darwin, William D. ; Huestis, Marilyn A. ; Cone, Edward J. ; Mitchell, John M. / Validity testing of the accu pinch tm thc test. In: Journal of Analytical Toxicology. 1995 ; Vol. 19, No. 1. pp. 5-12.
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