A method of preparing isolated body tissue (10) for cryogenic storage, the method comprising a step of actively infusing the body tissue (10) with a cryoprotectant (20). Additionally, a kit for preparing umbilical cord tissue (10) for cryogenic storage, comprising a cryoprotectant (20) and infusion means (22) for actively infusing the umbilical cord tissue (10) with the cryoprotectant (20).