JPAC Joint United Kingdom (UK) Blood Transfusion and Tissue Transplantation Services Professional Advisory Committee

Appendix III Volume of blood processed per pass

Figure 3.1 Volume of blood processed per cycle vs donor haematocrit. Based on haematocrit
of 0.80 in bowl and a flow rate of 60–80 mL/min. Includes harness volume of 35 mL.
Source: Haemonetics Corporation.

Figure 3.1 draws attention to the fact that for donors with a low haematocrit an increased volume of blood is processed at each pass. This will influence the ECV accumulating throughout the procedure and this particular group of donors may become symptomatically hypovolaemic.