How to use Fentanyl Test Strips – IV Users Infographic GuideBy Jamie Bartlett / August 1, 2024 This is a comprehensive guide to testing substances that are used intravenously using WiseBatch fentanyl testing strips. IV_infograph_finalDownload How to use Fentanyl Test Strips – IV Users Guide (English) spanish_IV_infographDownload How to use Fentanyl Test Strips – IV Users Guide (Spanish)