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Table 2 Percentiles for fetal superior vena cava peak systolic velocity at 20–40 weeks of gestational age (GA)

From: Reference ranges of fetal superior vena cava blood flow velocities and pulsatility index in the second half of pregnancy: a longitudinal study

  

Percentile

GA (weeks)

n

2.5th

5th

10th

50th

90th

95th

97.5th

20

21

15.07

16.13

17.44

23.00

30.34

32.81

35.12

21

33

15.40

16.51

17.88

23.71

31.43

34.04

36.49

22

30

15.75

16.90

18.33

24.43

32.56

35.32

37.90

23

32

16.10

17.30

18.79

25.17

33.73

36.64

39.37

24

17

16.46

17.70

19.26

25.94

34.94

38.01

40.90

25

30

16.82

18.12

19.75

26.73

36.19

39.43

42.48

26

29

17.20

18.55

20.24

27.55

37.49

40.91

44.13

27

27

17.58

18.99

20.75

28.39

38.84

42.44

45.84

28

27

17.97

19.44

21.27

29.25

40.23

44.03

47.62

29

21

18.37

19.90

21.81

30.15

41.68

45.68

49.46

30

35

18.78

20.37

22.35

31.07

43.17

47.39

51.38

31

27

19.20

20.85

22.92

32.01

44.72

49.16

53.37

32

19

19.63

21.34

23.49

32.99

46.33

51.00

55.44

33

25

20.07

21.84

24.08

34.00

47.99

52.91

57.59

34

25

20.52

22.36

24.69

35.03

49.71

54.89

59.82

35

27

20.97

22.89

25.31

36.10

51.50

56.95

62.14

36

20

21.44

23.43

25.94

37.20

53.35

59.08

64.55

37

20

21.92

23.98

26.60

38.34

55.26

61.29

67.05

38

25

22.41

24.55

27.27

39.51

57.25

63.59

69.65

39

18

22.91

25.13

27.95

40.71

59.30

65.97

72.35

40

2

23.42

25.72

28.65

41.95

61.43

68.44

75.16