Barriers along the diagnostics value chain, based on the GHDonline Expert Panel discussion analysis. Barriers along the diagnostics value chain, based on the GHDonline Expert Panel discussion analysis. GHDonline, Global Health Delivery Online; QA/QC, quality assurance/quality control. Nora Engel et al. BMJ Glob Health 2016;1:e000132 Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/