Sonographic Detection of Chromosomal Abnormalities







TABLE G-1

Distribution of Nuchal Translucency Measurements by Crown-Rump Length

From Jelliffe-Pawlowski LL, Norton ME, Shaw GM, et al: Risk of critical congenital heart defects by nuchal translucency norms. Am J Obstet Gynecol 212(4):518.e1-518.e10, 2015.





































































































































































































































































































































































































































































































































































































Crown-Rump Length (mm) Gestational Age (wk) N Mean (mm) Median (mm) Standard Deviation (mm) PERCENTILE CUTPOINT (mm) PERCENTILE CUTPOINT (MoM) Percentile Equivalent at 3.5 mm
90th 95th 99th 90th 95th 99th
45.0 11.3 404 1.17 1.1 0.31 1.5 1.7 2.0 1.31 1.42 1.82 99.8
46.0 11.4 620 1.22 1.2 0.38 1.6 1.8 2.9 1.37 1.58 2.45 99.6
47.0 11.5 667 1.21 1.2 0.33 1.6 1.8 2.2 1.30 1.44 2.02 99.8
48.0 11.6 796 1.26 1.2 0.39 1.7 1.9 2.9 1.35 1.55 2.32 99.6
49.0 11.7 853 1.25 1.2 0.33 1.6 1.8 2.5 1.28 1.45 1.90 99.8
50.0 11.7 1048 1.29 1.2 0.36 1.7 1.8 2.6 1.34 1.49 2.08 99.7
51.0 11.8 1256 1.31 1.2 0.38 1.7 1.9 2.8 1.34 1.53 2.17 99.8
52.0 11.9 1401 1.31 1.3 0.30 1.7 1.8 2.3 1.29 1.40 1.71 99.9
53.0 12.0 1783 1.35 1.3 0.39 1.7 1.9 2.6 1.32 1.44 1.98 99.7
54.0 12.0 1919 1.37 1.3 0.34 1.8 2.0 2.4 1.33 1.47 1.83 99.8
55.0 12.1 2089 1.41 1.4 0.42 1.8 2.0 2.6 1.32 1.46 2.02 99.6
56.0 12.2 2247 1.42 1.4 0.36 1.8 2.0 2.6 1.33 1.45 1.89 99.7
57.0 12.3 2439 1.44 1.4 0.35 1.8 2.0 2.5 1.33 1.46 1.85 99.9
58.0 12.3 2695 1.48 1.4 0.39 1.9 2.1 2.6 1.35 1.48 1.92 99.6
59.0 12.4 2831 1.51 1.5 0.42 1.9 2.1 2.8 1.35 1.49 1.93 99.6
60.0 12.5 3011 1.54 1.5 0.39 2.0 2.2 2.7 1.38 1.50 1.98 99.7
61.0 12.6 3050 1.55 1.5 0.37 2.0 2.2 2.6 1.35 1.50 1.79 99.8
62.0 12.6 3185 1.57 1.5 0.37 2.0 2.2 2.8 1.36 1.48 1.91 99.8
63.0 12.7 3156 1.60 1.5 0.38 2.1 2.3 2.7 1.35 1.48 1.85 99.8
64.0 12.8 3217 1.62 1.6 0.41 2.1 2.3 2.8 1.38 1.51 1.81 99.8
65.0 12.8 3125 1.64 1.6 0.39 2.1 2.3 2.8 1.35 1.47 1.83 99.7
66.0 12.9 3171 1.67 1.6 0.42 2.2 2.4 2.9 1.37 1.50 1.91 99.6
67.0 13.0 3083 1.69 1.6 0.42 2.2 2.4 2.8 1.37 1.51 1.81 99.7
68.0 13.1 2872 1.70 1.7 0.40 2.2 2.4 2.8 1.35 1.50 1.76 99.9
69.0 13.1 2779 1.72 1.7 0.41 2.2 2.4 2.9 1.35 1.46 1.80 99.8
70.0 13.2 2662 1.74 1.7 0.40 2.2 2.4 2.9 1.35 1.46 1.78 99.8
71.0 13.3 2483 1.79 1.7 0.41 2.3 2.5 3.0 1.37 1.48 1.77 99.7
72.0 13.4 2337 1.78 1.7 0.43 2.3 2.5 3.0 1.34 1.48 1.79 99.7
73.0 13.4 2150 1.79 1.8 0.43 2.3 2.5 2.9 1.34 1.45 1.74 99.7
74.0 13.5 2015 1.82 1.8 0.44 2.3 2.5 3.0 1.34 1.45 1.83 99.7
75.0 13.6 1920 1.80 1.8 0.43 2.3 2.5 3.1 1.31 1.49 1.75 99.7
76.0 13.7 1799 1.83 1.8 0.44 2.4 2.6 3.1 1.30 1.42 1.75 99.6
77.0 13.8 1542 1.85 1.8 0.45 2.4 2.6 3.3 1.30 1.43 1.75 99.4
78.0 13.8 1477 1.81 1.8 0.44 2.4 2.5 3.1 1.29 1.42 1.73 99.5
79.0 13.9 1215 1.85 1.8 0.47 2.4 2.5 3.0 1.27 1.38 1.65 99.7
80.0 14.0 778 1.84 1.8 0.43 2.4 2.7 3.1 1.27 1.39 1.69 99.8
81.0 14.1 625 1.86 1.8 0.45 2.4 2.7 3.2 1.24 1.39 1.67 99.6
82.0 14.2 592 1.86 1.8 0.45 2.4 2.6 3.3 1.23 1.33 1.66 99.4
83.0 14.2 611 1.85 1.8 0.44 2.4 2.6 2.8 1.18 1.27 1.47 99.8
84.0 14.2 383 1.86 1.8 0.45 2.5 2.6 3.1 1.23 1.35 1.84 99.7

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Nov 8, 2019 | Posted by in GYNECOLOGY | Comments Off on Sonographic Detection of Chromosomal Abnormalities

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