Figure 48-2 The maximum allowable blood loss in a patient with a blood volume of 5,000 mL and an initial hematocrit level of 45% (the red lines) or 40% (the black and gray lines), with and without acute normovolemic hemodilution (ANH). (From Goodnough LT, Brecher ME, Monk TG: Acute normovolemic hemodilution in surgery. Hematology 2:413–420, 1992, with permission.)