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Length of Fetal Long Bones (mm) vs Menstrual Age

 

  Tibia (%) Fibula (%) Femur (%) Humerus (%) Ulna (%) Radius (%)
Week 5th 50th 95th 5th 50th 95th 5th 50th 95th 5th 50th 95th 5th 50th 95th 5th 50th 95th
12 - 7 - - 6 - 4 8 13 - 9 - - 7 - - 7 -
13 - 10 - - 9 - 6 11 16 6 11 16 5 10 15 6 10 14
16 12 17 22 13 18 23 15 20 24 15 20 25 13 18 23 13 18 22
17 15 20 25 13 21 28 18 23 27 18 22 27 16 21 26 14 20 26
18 17 22 27 15 23 31 21 25 30 20 25 30 19 24 29 15 22 29
19 20 25 30 19 26 33 24 28 33 23 28 33 21 26 31 20 24 29
20 22 27 33 21 28 36 26 31 36 25 30 35 24 29 34 22 27 32
21 25 30 35 24 31 37 29 34 38 28 33 38 26 31 36 24 29 33
22 27 32 38 27 33 39 32 36 41 30 35 40 28 33 38 27 31 34
23 30 35 40 28 35 42 35 39 44 33 38 42 31 36 41 26 32 39
24 32 37 42 29 37 45 37 42 46 35 40 45 33 38 43 26 34 42
25 34 40 45 34 40 45 40 44 49 37 42 47 35 40 45 31 36 41
26 37 42 47 36 42 47 42 47 51 39 44 49 37 42 47 32 37 43
27 39 44 49 37 44 50 45 49 54 41 46 51 39 44 49 33 39 45
28 41 46 51 38 45 53 47 52 56 43 48 53 41 46 51 33 40 48
29 43 48 53 41 47 54 50 54 59 45 50 55 43 48 53 36 42 47
30 45 50 55 43 49 56 52 56 61 47 51 56 44 49 54 36 42 47
31 47 52 57 42 51 59 54 59 63 48 53 58 46 51 56 38 44 50
32 48 54 59 42 52 63 56 61 65 50 55 60 48 53 58 37 45 53
33 50 55 60 46 54 62 58 63 67 51 56 61 49 54 59 41 46 51
34 52 57 62 46 55 65 60 65 69 53 58 63 51 56 61 40 47 53
35 53 58 64 51 57 62 62 67 71 54 59 64 52 57 62 41 48 54
36 55 60 65 54 58 63 64 68 73 56 61 65 53 58 63 39 48 57
37 56 61 67 54 59 65 65 70 74 57 62 67 55 60 65 45 49 53

From:Sherer DM, Ghezzi F, Cohen J, Romero R. Fetal Skeletal Anomalies in Sonography in Obstetrics and Gynecology:Principles and Practice Ed by AC Fleischer et al., Appleton & Lange, Stamford, 1996.

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Ultrasound Educational Press     Go Top
Peter W. Callen, M.D.
Professor of Radiology, Obstetrics, Gynecology and Reproductive Science
University of California Medical Center, San Francisco, California

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