Fig. 5. Fractional blood volume loss required for acute normovolemic hemodilution to save 180 ml (1.0 unit) erythrocytes for trigger hematocrit, Ht, and initial hematocrit, Ho, with a blood volume of 5.0 l (solid lines) or 3.5 l (dashed lines), as defined by equation 13. Absence of a plotted curve for a given Hoand Htindicates that is not possible to save 180 ml erythrocytes for those conditions.