If "Hi" is 0.40 one must remove at least 7.5 units of blood during ANH, resulting in an "Hm" of 0.20 to save two units equivalence. Clearly, the greater the "Hi" and the greater the number of units removed during hemodilution, the more effective ANH is for preventing homologous blood transfusion. The model here is designed to allow doctors to determine where ANH may be beneficial for a patient based on their knowledge of the "Hi", the potential for SBL, and an estimate of the "Hm". Though the model used a 70 kg patient, the result can be applied to any patient. To apply these result to any body weight, any of the values BLs, BLH and ANHH or PRBC given in the table need to be multiplied by the factor we will call T