Smith and Yarbrough developed an equation for predicting the plasma volume of a woman during the second half of a normal pregnancy. The authors are from the University of California San Francisco and the University of California Berkeley.
Parameters:
(1) body surface area in square meters (using the equation of Dubois)
(2) value for week of gestation
Week of Gestation
Value
< 20
NA
20 - 22
1
22 - 24
2
24 - 26
3
26 - 28
4
28 - 30
5
30 - 32
6
32 - 34
7
34 - 36
8
36 - 38
9
38 - 40
10
40 - 42
11
> 42
NA
predicted plasma volume in mL =
= 673 + (32.9 * (value for week gestation)) + (1857.2 * (body surface area in square meters))
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