Table 2

 Performance of established formulae in predicting the rise in Hb or Hct following transfusion

Established formula for volume of packed red cells (ml)Actual/predicted rise median (interquartile range)
Values shown are median value and interquartile range of individual data for 82 children without confounding variables.
3 × wt (kg) × desired rise in Hb (g/dl)0.64 (0.46–0.78)
4 × wt (kg) × desired rise in Hb (g/dl)0.85 (0.61–1.04)
1 × wt (kg) × desired rise in Hct (%)0.61 (0.46–0.81)