Stem cell banking involves collecting, testing and freezing cells for possible future medical use. For families considering banking at birth, the main options are umbilical cord blood and cord tissue. Their contents and medical uses differ.
What is being stored?
Cord blood contains blood-forming stem cells used in transplantation for certain blood cancers, inherited metabolic disorders and immune deficiencies. Whether a stored unit is suitable depends on the diagnosis, donor compatibility, cell quantity and quality. A child’s own cord blood may be unsuitable for an inherited condition because it carries the same genetic change.
Cord tissue can provide mesenchymal stromal cells, commonly called MSCs. Beike describes using cells derived from donated cord blood and cord tissue, separately or together depending on the protocol. These preparations differ from cord blood units stored for blood-forming stem cell transplantation.
A storage contract should identify whether the bank preserves whole tissue, isolated cells or a processed blood unit, and what further processing would be required before use.
Public, private and directed banking
| Option | Intended access | Main consideration |
|---|---|---|
| Public donation | Available for a compatible recipient | The donated unit is not reserved for the family |
| Private banking | Reserved under a family’s contract | Collection and storage fees; future suitability remains uncertain |
| Directed donation | Collected for an identified relative with a medical need | Requires planning with the treating transplant team |
ACOG recommends public banking and states that available evidence does not support routine private cord blood banking. Directed collection may be appropriate when a family member has a condition for which transplantation is indicated.
What recent storage research shows
Long storage periods can preserve useful cells, but different quality measurements do not always produce the same finding.
| Study | Material examined | Finding |
|---|---|---|
| Stem Cells Translational Medicine, 2026 | 1,129 cord blood units stored for up to 19 years | Colony-forming capacity per CD34+ cell remained preserved after adjustment for testing date |
| Vox Sanguinis, 2026 | 726 cord blood units | CD34+ cell viability declined with longer storage; average post-thaw viability was 91.2% |
| Stem Cells Translational Medicine, January 2024 issue | Units processed using three methods, with storage periods reaching 18, 25 and 29 years | Stability testing documented retained cell quality over extended storage |
These studies used different measurements and processing methods. Their results cannot establish a universal expiry date or guarantee the quality of an individual stored sample.
Collection and quality control
Collection takes place after birth and cord clamping. It requires advance arrangements, and circumstances during delivery may prevent an adequate collection. ACOG advises that collection should not compromise obstetric or newborn care or alter routine delayed cord clamping, apart from rare medical indications for directed donation.
Before signing a contract, request written information about:
- Cell counts, viability, infectious-disease testing and acceptance thresholds.
- Temperature monitoring, emergency arrangements and transport controls.
- Testing performed before release for treatment.
- Collection, annual storage, release and transfer fees.
- Ownership, consent and arrangements if the bank closes.
Check the bank’s regulatory status in the country where it operates. FDA registration records a facility’s activities; it does not mean that the FDA endorses the bank.
Storage and future treatment
Banking preserves a sample. Future use still requires a suitable diagnosis, adequate cells and an appropriate treatment protocol. Families should discuss an existing medical need with a transplant specialist and review the bank’s contract before paying for long-term storage.
