[Study on the collecting method of human umbilical cord blood].

The methods of cord blood collection was investigated in this study. The purpose of this study was to evaluate human umbilical cord blood as a alternative to bone marrow in the provision of transplantable progenitor cells for hematopoietic reconstitution. The results showed that using modified technique with a sterile and closed system, the volume of cord and placental blood would all exceed 120 ml. The average amount of blood collected was 132.2 +/- 12.13 ml and the highest was 158 ml. Cord blood culture for bacteria and fungi were negative. Blood clots were not present. And in the examination of each single cord blood, the contents of nucleated cells (NS) and mono-nucleated (MNS) were, respectively, 18.9 X 10 +/- 1.7 X 10, 8.2 X 10 +/- 0.8 X 10. The result suggested that the collection of placental blood with the modified technique in a sterile and closed system is a simple, safe and efficient procedure. The average amount of blood collected and hematopoietic cells would satisfy the needs of cord blood transplantation. Immediate cut of the umbilical cord followed by a prompt puncturing is critical for the volume and quality of the sample.