Safe-Wrap Brand RNA Medical® Capillary Sample Tube. Use this tube for the collection of capillary blood samples for use with i-STAT blood gas, electrolyte and chemistry cartridges requiring either 95 or 65µL of sample. Tube is Mylar® wrapped for safety and regulatory compliance and treated with calcium-balanced lithium heparin. Plunger provides for easy dispensing. 50 tubes per package. UOM: 50/PK.