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Table 2 Reference intervals for GSD, YSD, CRL and HR based on GD

From: Reference intervals of gestational sac, yolk sac, embryonic length, embryonic heart rate at 6–10 weeks after in vitro fertilization-embryo transfer

Gestational days n GSD (mm) CRL (mm) YSD (mm) HR (bpm)
5th 50th 95th 5th 50th 95th 5th 50th 95th 5th 50th 95th
42 159 11.5 16.0 21.5 1.5 2.2 4.0 3.0 3.6 4.5 96.0 108.0 117.0
43 503 12.0 17.0 23.5 1.8 2.6 4.1 3.0 3.6 4.6 101.2 109.0 115.0
44 2077 13.5 18.0 24.0 2.0 3.0 4.3 3.0 3.6 4.6 104.0 112.0 121.0
45 12,687 14.0 19.0 25.0 2.4 3.4 4.9 3.1 3.7 4.6 103.0 117.0 128.0
46 2726 14.0 19.5 26.0 2.6 3.9 5.7 3.1 3.8 4.7 103.0 118.0 129.0
47 1472 14.5 21.0 28.0 3.0 4.8 7.2 3.1 3.9 4.9 112.0 122.0 135.0
48 648 14.5 21.5 29.0 3.4 5.6 8.1 3.2 4.0 5.0 114.0 124.0 140.0
49 389 13.8 22.5 31.8 3.9 6.7 9.5 3.3 4.1 5.0 120.0 132.0 148.0
50 366 15.0 23.5 33.5 4.7 8.0 10.8 3.4 4.2 5.3 122.0 135.0 150.0
51 326 15.9 24.5 32.8 5.4 8.9 11.8 3.6 4.3 5.3 121.0 140.0 154.0
52 760 17.0 26.0 35.5 6.1 10.1 12.6 3.6 4.3 5.3 128.1 147.0 158.0
53 321 16.6 26.0 35.0 8.0 10.8 13.7 3.6 4.4 5.5 134.0 149.0 168.6
54 328 18.5 28.0 37.5 9.0 12.4 15.2 3.9 4.5 5.4 136.9 154.0 169.0
55 479 21.0 29.0 37.5 10.2 13.6 16.4 3.8 4.5 5.4 145.0 159.0 173.0
56 269 20.5 30.5 39.5 10.5 14.6 17.2 3.9 4.6 5.4 142.5 162.0 174.0
57 280 21.5 31.5 41.5 11.9 15.8 19.0 3.8 4.6 5.5 148.0 167.0 181.9
58 199 23.0 33.0 42.5 13.9 17.1 20.1 4.0 4.6 5.5 149.0 170.0 185.0
59 230 24.5 34.0 45.7 15.1 18.3 21.0 4.0 4.8 5.7 160.0 174.0 185.0
60 321 28.1 35.5 44.5 16.7 19.1 21.6 4.0 4.7 5.7 162.2 174.0 188.0
61 563 29.5 36.5 46.5 18.0 20.2 22.4 4.0 4.8 5.6 167.0 176.0 188.0
62 2247 30.5 37.5 47.3 19.0 21.0 23.2 4.2 4.8 5.6 160.0 176.0 188.0
63 662 31.0 38.0 47.5 19.5 21.8 24.4 4.1 4.9 5.7 161.2 176.0 188.0
64 583 31.5 39.0 48.9 20.3 23.0 25.3 4.2 5.0 5.8 164.0 178.0 188.0
65 319 32.0 40.0 50.5 21.0 24.0 26.9 4.2 5.0 5.8 164.0 176.0 186.0
66 207 32.5 40.0 50.5 21.7 25.0 28.8 4.2 5.1 5.9 164.0 178.0 190.6
67 282 33.6 42.5 51.0 22.5 26.5 30.8 4.4 5.2 6.0 158.2 176.0 190.0
68 57 37.5 44.5 55.2 23.9 28.9 31.0 4.3 5.2 6.8 161.4 174.0 188.0
69 157 31.4 43.5 53.0 24.0 29.1 33.0 4.3 5.2 6.1 166.9 176.0 189.1
70 106 35.9 43.5 54.5 26.0 31.0 34.1 4.4 5.1 6.0 156.4 176.0 186.7
71 121 35.1 46.0 56.4 27.9 32.3 36.4 4.3 5.2 6.2 164.0 175.0 188.0
72 255 38.4 47.0 57.0 29.2 34.3 38.4 4.4 5.2 6.2 158.0 174.0 186.0
73 132 37.0 46.0 56.2 31.6 36.4 41.7 4.5 5.4 6.7 159.7 174.0 186.7
74 104 37.0 48.0 60.3 33.1 38.0 42.9 4.2 5.3 6.5 160.0 173.5 185.0
75 51 39.0 49.0 62.4 34.5 38.3 46.4 4.2 5.3 6.9 162.6 171.0 186.2
76 30 37.4 49.0 62.2 35.0 40.1 45.1 4.3 5.5 6.9 164.0 172.0 188.9