How does private cord blood banking work and what do you need to do to save your baby's cord blood stem cells? 1) Enroll 2) Bring the collection kit with you to your delivery 3) Call the courier That’s it! So what does Cord Blood Registry do? Your collected sample is shipped to our lab where our lab technicians perform quality tests. We save the cord blood stem cells and let you know when we have securely stored your sample until you need them.