孕周

双顶径(平均值)cm

腹围(平均值)cm

股骨长(平均值)cm

13周

2.52士0.25

6.90士l.65

1.17士0.31

14周

2.83士0.57

7.77士1.82

1.38士0.48

15周

3.23士0.51

9.13士1.56

1.74士0.58

16周

3.62士0.58

10.32士1.92

2.10士0.51

17周

3.97士0.44

11.49士1.62

2.52士0.44

18周

4.25士0.53

12.41士l.89

2.71士0.46

19周

4.52士0.53

13.59士2.30

3.03士0.50

20周

4.88士0.58

14.80士l.89

3.35士0.47

21周

5.22士0.42

15.62士1.84

3.64士0.40

22周

5.45士0.57

16.70士2.23

3.82士0.47

23周

5.80士0.44

17.90士1.85

4.21士0.41

24周

6.05士0.50

18.74士2.23

4.36士0.51

25周

6.39士0.70

19.64士2.20

4.65士0.42

26周

6.68士0.61

21.62士2.30

4.87士0.41

27周

6.98士0.57

21.81士2.12

5.10士0.41

28周

7.24士0.65

22.86士2.41

5.35士0.55

29周

7.50士0.65

23.71士1.50

5.61士0.44

30周

7.83士0.62

24.88士2.03

5.77士0.47

31周

8.06士0.60

25.78士2.32

6.03士0.38

32周

8.17士0.65

26.20士2.33

6.43士0.49

33周

8.50士0.47

27.78士2.30

6.52士0.46

34周

8.61士0.63

27.99士2.55

6.62士0.43

35周

8.70士0.55

28.74士2.88

6.71士0.45

36周

8.81士0.57

29.44士2.83

6.95士0.47

37周

9.00士0.63

30.14士2.17

7.10士0.52

38周

9.08士0.59

30.63士2.83

7.20士0.43

39周

9.21士0.59

31.34士3.12

7.34士0.53

40周

9.28士0.50

31.49士2.79

7.40士0.53