Texas has state legislation around cord blood education that follows the Institute of Medicine guidelines and mandates/encourages physicians to educate expectant parents about ALL forms of cord blood banking. The Texas Dept. of Health is also tasked to to educate the public about programs that offer free family cord blood storage when the family has an existing medical need. The Texas bill was enacted 18 May 2007 and became effective 1 Jan. 2008.
- How much cord blood is needed for a transplant?
The crucial thing is not the volume of the cord blood collection, but the number of stem cells it contains. Transplant doctors develop recommendations based on the Total Nucleated Cell count, or TNC, because it is the easiest measure to reproduce between different labs. For treating cancer, the transplant dose should be at least 25 million TNC per kilogram of patient body weight (1 kilogram equals 2.2 pounds). The average cord blood collection holds 8.6 million TNC per mL. Thus, the optimal transplant dose requires harvesting:
1.3 mL of cord blood for every pound of patient weight, -or-
2.9 mL of cord blood for every kg of patient weight
However, as more transplant centers are adopting the practice of giving adult patients "double cord blood transplants" with two cord blood units, it is less critical for both units to have adequate cell dose.
Reed, W et al., Blood 2003;101(1):351
Barker, JN et al., Blood 2005;105:1343-1347
Eapen, M et al. Lancet 2007;369:1947-54
Rocha & Gluckman Brit. J. Haematology 2008;147:262-274
Delaney, C et al., Brit. J. Haematology 2009;147:207-216
Michallet et al. 2010 Blood 2010;116:Abstract#361
- What questions should parents ask a Family Bank about the Storage Facility?
- What type of records do parents receive after storage?
- Does your contract state that the storage fee is fixed, or may it increase later?
- Does the bank reserve the right, in your contract, to change storage facilities?
- Does the bank operate their own storage facility, or is it provided by another laboratory?
- What type of accreditation or other certifications does the storage facility carry? In most banks the cord blood is stored in the lab where it was processed, and the accreditation of the lab covers the storage conditions.
- What is the geographic location of the storage facility: Is it at risk for hurricanes, earthquakes, or other natural disasters?
- What type of back-up systems does the storage facility have in case of power failure?
- What type of security systems does the storage facility have?
- Processing: How is cord blood processed before storage?
The three main components of cord blood, like any blood collection, can be separated by weight: the heaviest layer is the red blood cells (RBC), the lightest is the plasma (a clear white liquid), and in the middle is a pinkish layer called the "buffy coat" which contains the white blood cells (WBC), including stem cells. When banks process the cord blood, the final separated component that goes into storage is the buffy coat, even though only about 1% of the cells are actually stem cells. There is no procedure to separate out the stem cells alone.
The vast majority of blood processing methods rely on the different density of the three main blood components. They can be separated by sedimentation, or by centrifuge, or by a combination of the two techniques. The procedure can be performed manually by trained technicians or by automated machine.