Not all embryo transfers succeed, which gives rise to the practice of freezing extra embryos from an IVF cycle for future transfers. This allows those with at-risk fertility, due to age or treatments such as chemotherapy, to delay their transfer. Researchers introduce a standalone microfluidics system to automate the process of embryo vitrification of replacing water with cryoprotectants, which exposes embryos to a slow and constantly increasing concentration of cryoprotectants.