The volume of red blood cell transfused may be expressed in mL per kg, especially in children. This can be used to estimate the percent red blood cell volume replaced.
Parameters:
(1) total volume of packed red blood cells transfused
(2) hematocrit of packed red blood cells (usually 70-80%)
(3) age and gender of patient
(4) lean body weight
Red blood cell volume based on lean body weight (LBW) tends to be more accurate than that based on actual body weight.
red cell volume transfused in mL =
= (total volume transfused in mL) * (hematocrit as a percent) / 100
percent of red cell volume transfused =
= (red cell volume transfused in mL) / (estimated red blood cell volume in mL) * 100%
Red Blood Cell Volume in mL/kg LBW
Age of the Patient
Male
Female
premature
50
50
0-1 days
39
39
2-30 days
36
36
1-2 months
26
26
3-6 months
23
23
7-12 months
25
25
1-10 years
28
27
>= 11
28
25
from data in Chapter 02 (Section 02.10)
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