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Thirty-four national and international laboratories participated in the ring trial. The results have shown that there is good agreement of results between most laboratories. The data includes instrument types and limits of detection which helped assess the capability of testing laboratories and which will be invaluable information to determine the UK capability in analysing CBD products and controlled cannabinoids.
CBD and controlled cannabinoids – Ring trial report
The project has been funded by the Department for Business, Energy & Industrial Strategy (BEIS), the Food Standards Agency (FSA), the Home Office and the Office for Product Safety & Standards (OPSS) and has been carried out in collaboration with Food Standards Scotland (FSS) and the Defence Science and Technology Laboratory (DSTL).
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Cannabidiol (CBD) products have rapidly entered the UK market in a variety of forms, including food and cosmetics. Laboratories across the UK need to be able to accurately measure the CBD content as well as the controlled cannabinoid content in commercially available products. CBD and cannabinoids have been highlighted as difficult compounds to analyse. The aim of the ring trial was to share and compare methods for quantifying CBD and controlled cannabinoids in food and cosmetics among testing laboratories
The common bile duct (CBD) was measured in 600 ultrasound studies. In normal patients the mean width of the CBD increased from 2.8 mm in the age group 20 years or younger to 4.1 mm in patients 71 years of age or older. The mean width of the CBD for all age groups in normal cases was 3.4 (range 2 to 11 mm). In presence of cholelithiasis the mean width of the CBD was 4.5 mm (range 2 to 15 mm). There was no further increase of the CBD after cholecystectomy (mean width 4.6 mm, range 2 to 12 mm). The CBD in patients with hepatocellular disease was wider than normals (mean 4.4 mm) and markedly increased in patients with pancreatic disease (mean 6.2 mm, range 2 to 21 mm) due to obstruction in several cases.