FAQ Animal Isolation Calendar Posters HepatAlert Instructional Sheets Protocols & Tutorials Brochures Case Studies & Application Notes Webinars and Videos Ready-to-ship Inventory FAQ - MEDIA What is the expiration date of the InVitroGRO™ PT medium? The InVitroGRO™ PT medium will last 60 days from the day of receipt. What InVitroGRO™ hepatocyte medium should I use for an induction assay? Our InVitroGRO™ HI medium is optimized and formulated for use in induction assays. Go to Resources and click on protocols to find our induction assay protocol.