Table 2.

OSTHEO algorithm for blood loss

Total blood loss (ml) = [total RBC loss (ml)]/0.35

Total RBC loss (ml) = [uncompensated RBC loss (ml)] + [compensated RBC loss (ml)]

Uncompensated RBC loss (ml) = [initial RBC (ml)] – [final RBC (ml)]

Compensated RBC loss = sum of RBCs received from the various sources of transfusion

Initial RBC (ml) = [estimated blood volume (ml)] × [initial Hct level (%)] at day −1

Final RBC (ml) = [estimated blood volume (ml)] × [final Hct level (%)] at day +3

Estimated blood volume (ml) = women: [body surface area (m2)] × 2,430; men: [body surface area (m2)] × 2,530

Body surface area (m2) = 0.0235 × [height (cm)]0.42246 × [weight (kg)]0.52456