Umbilical Artery Pulsatility Index (PI)

 

         Arduinin D et.al. J Perinat Med 1990;18(3):165-172

 

 

GA

(wks)

 

50th

 Percentile

5th

Percentile

95th

Percentile

20

1.54

1.04

2.03

21

1.47

0.98

1.96

22

1.41

0.92

1.9

23

1.35

0.86

1.85

24

1.3

0.81

1.79

25

1.25

0.76

1.74

26

1.2

0.71

1.69

27

1.16

0.67

1.65

28

1.12

0.63

1.61

29

1.08

0.59

1.57

30

1.05

0.56

1.54

31

1.02

0.53

1.51

32

0.99

0.5

1.48

33

0.97

0.48

1.46

34

0.95

0.46

1.44

35

0.94

0.44

1.43

36

0.92

0.43

1.42

37

0.92

0.42

1.41

38

0.91

0.42

1.4

39

0.91

0.42

1.4

40

0.91

0.42

1.4

41

0.92

0.42

1.41

42

0.93

0.43

1.42