ExpectedPeakVelocityofSystolicBloodFlowintheMiddleCerebralArteryasaFunctionofGestationalAge
Velocity=cm/s
MultiplesoftheMedian
GestationalAge(wks)
1.00
1.29
1.50
1.55
18
23.2
29.9
34.8
36.0
20
25.5
32.8
38.2
39.5
22
27.9
36.0
41.9
43.3
24
30.7
39.5
46.0
47.5
26
33.6
43.3
50.4
52.1
28
36.9
47.6
55.4
57.2
30
40.5
52.2
60.7
62.8
32
44.4
57.3
66.6
68.9
34
48.7
62.9
73.1
75.6
36
53.5
69.0
80.2
82.9
38
58.7
75.7
88.0
91.0
40
64.4
83.0
96.6
99.8
From:G.Mari,R.L.Deter,R.L.Carpenter,F.Rahman,R.Zimmermann,K.J.Moise,Jr.etal.,NoninvasivediagnosisbyDopplerultrasonographyoffetalanemiaduetomaternalred-cellalloimmunization.NEnglJMed(),pp.9–14
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