Saving cord blood means collecting blood from your baby’s umbilical cord immediately after delivery and storing it in a specialized facility where the stem cells inside remain viable for decades. The process itself is simple and painless, but the decisions you need to make, including when to arrange it, which type of bank to use, and how it fits with delayed cord clamping, require some planning well before your due date.
How Collection Works
Cord blood is collected in the minutes after your baby is born, once the umbilical cord has been cut and clamped. A needle attached to a collection bag is inserted into the cord, and blood drains into the bag by gravity. The entire process takes about five to ten minutes. It’s painless for both you and your baby, and it doesn’t interfere with delivery whether you have a vaginal birth or a cesarean section.
Your doctor, midwife, or a trained collection technician handles the draw. If you’re using a private bank, they’ll typically ship you a collection kit in advance that includes the bag, tubes for a maternal blood sample, labels, and a temperature-controlled shipping container. You bring the kit to the hospital and hand it to your delivery team. For public bank donations, the hospital’s own staff usually manages everything if the facility participates in a public banking program.
Volume matters. A cord blood unit needs enough stem cells to be useful for transplant, and a low-volume collection may not meet the threshold for storage. Factors like the size of the placenta, the length of the cord, and how quickly collection begins all affect how much blood is recovered.
Delayed Cord Clamping and Collection
Both the American College of Obstetricians and Gynecologists (ACOG) and the American Academy of Pediatrics now recommend delaying cord clamping for at least 30 to 60 seconds after birth for most healthy term and preterm infants. This pause allows extra blood to flow from the placenta to the baby, boosting iron stores and hemoglobin levels in the newborn.
The tradeoff is that delayed clamping reduces the volume of blood left in the cord for collection. In some cases, the remaining volume is still sufficient for banking. In others, especially with longer delays, it may fall short. Talk to your provider about your priorities. Many families choose the benefits of delayed clamping and accept a smaller cord blood collection, while others opt for a shorter delay to maximize the sample. There’s no single right answer, but it’s a conversation worth having before you’re in the delivery room.
Public vs. Private Banking
The biggest decision in cord blood banking is whether to donate to a public bank or pay for private storage. The two options differ in cost, access, and purpose.
Public Banking
Donating to a public cord blood bank is free. Your baby’s cord blood is added to a national registry and made available to any patient who needs a stem cell transplant. Once you donate, you give up ownership and access to that unit. If your own child or a family member later needs cord blood, there’s no guarantee the donated unit will still be available. Public banks screen and test donations rigorously, and units that don’t meet quality standards are used for research or discarded. Not every hospital participates in public banking, so you’ll need to check whether your delivery site is affiliated with a collection program.
Private Banking
Private banks store your baby’s cord blood exclusively for your family. You retain full rights and immediate access if it’s ever needed. The cost includes an upfront collection and processing fee, typically ranging from $1,000 to $2,500 depending on the company and plan, plus annual storage fees that generally run $100 to $200 per year. Some companies offer prepaid plans that cover storage for 18 or 20 years at a discounted rate. The ongoing expense is the main drawback, especially given that the statistical likelihood of your child actually needing their own cord blood is low.
A middle ground some families consider: donating to a public bank (free, helps others) while recognizing that a sibling match from the registry is possible if a family need arises later. About 25% of patients who need a stem cell transplant find a fully matched donor within their own family. The remaining 75% rely on unrelated donors through public registries.
Screening and Eligibility
Before your cord blood can be stored or donated, you’ll go through a health screening. This involves a questionnaire about your medical history, travel, and risk factors for infectious disease, plus a maternal blood draw tested for infections like HIV, hepatitis B, hepatitis C, and other communicable diseases. The FDA requires a formal donor eligibility determination for every cord blood unit.
If your blood tests come back positive for any screened infections, the cord blood unit is flagged and labeled accordingly. Public banks will typically reject the unit for transplant use. Private banks may still store it for your family but will note the test results. Certain genetic conditions or pregnancy complications can also affect eligibility, so the screening paperwork is usually completed during your third trimester to avoid last-minute surprises.
Shipping and Processing
Once collected, the cord blood unit needs to reach the processing lab quickly. For optimal stem cell viability, cord blood should be processed and frozen within 72 hours of collection, though sooner is better. Private banks include a prepaid courier service with their collection kits. The container is temperature-controlled to keep the blood stable during transit.
At the lab, technicians process the blood to concentrate the stem cells, remove excess red blood cells and plasma, and prepare the sample for freezing. The unit is then slowly cooled to extremely low temperatures (around negative 196 degrees Celsius in liquid nitrogen) through a process called cryopreservation. This deep freeze essentially stops all biological activity, preserving the cells in a suspended state.
How Long Cord Blood Lasts in Storage
Frozen cord blood remains viable for a remarkably long time. Research led by Dr. Hal Broxmeyer at the New York Blood Center tested cord blood units that had been frozen for over 23 years and found no significant decline in stem cell quality or viability compared to samples stored for shorter periods. The evidence suggests that properly cryopreserved cord blood can last indefinitely, though most banks initially quote a storage commitment of 18 to 25 years.
The key factor isn’t time but storage conditions. As long as the unit stays at a consistent ultra-low temperature without interruption, the cells remain intact. Reputable banks have backup cooling systems and monitoring protocols to prevent temperature fluctuations.
What Cord Blood Is Used For
Cord blood stem cells are primarily used to treat blood and immune system disorders. These include leukemia, lymphoma, sickle cell disease, thalassemia, and certain inherited immune deficiencies. In a transplant, the stem cells replace a patient’s damaged or diseased bone marrow with healthy cells that can rebuild the blood and immune system.
Cord blood has some advantages over bone marrow from an adult donor. The stem cells are younger and more adaptable, which means they don’t need to be as precisely matched to the recipient. This is especially valuable for patients from ethnic backgrounds underrepresented on bone marrow registries, where finding an exact match can be difficult.
One limitation: a single cord blood unit contains fewer stem cells than an adult bone marrow donation. This means cord blood transplants work best for children and smaller adults. For larger patients, doctors sometimes use two cord blood units from different donors to reach the necessary cell count.
Timeline for Planning
If you want to bank cord blood, start the process during your second trimester. For private banking, you’ll need to choose a company, complete enrollment paperwork, undergo the health screening, and receive your collection kit, all before labor begins. Most private banks recommend having the kit in hand by week 34.
For public donation, contact your hospital or birthing center to ask whether they participate in a public cord blood program. If they don’t, you can reach out to the national Be The Match registry to find the nearest participating site. Some public programs require enrollment by week 34 as well.
On delivery day, make sure your medical team knows your plan. Place the collection kit where it’s visible, and confirm that whoever is delivering your baby is comfortable with the collection process. The most common reason cord blood goes uncollected is simply that no one in the room was prepared to do it.