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Table 3 Reference intervals for GSD, YSD, CRL and HR based on GW

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

Gestational weeks n GSD (mm) CRL (mm) YSD (mm) HR (bpm)
5th 50th 95th 5th 50th 95th 5th 50th 95th 5th 50th 95th
6 20,272 14.0 19.0 25.5 2.3 3.5 5.7 3.1 3.7 4.7 103.0 117.0 128.0
7 2969 16.5 26.0 35.5 5.3 10.1 14.8 3.5 4.3 5.3 124.0 146.0 164.5
8 4109 26.5 36.0 46.0 14.4 20.2 22.8 4.1 4.8 5.6 158.0 174.0 186.0
9 2267 31.5 40.0 50.0 20.2 23.4 29.8 4.2 5.0 5.8 162.4 176.0 188.0
10 799 37.0 46.5 57.5 29.0 34.5 41.2 4.4 5.3 6.4 160.0 174.0 186.0