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Fertilization and Gestational Age - Crown-Rump Length (ultrasound)

Fertilization Age (days) Gestational Age GA (week.day) Crown-Rump Length (mm) 37 5.2 1 38 5.3 2 39 5.4 3 40 55 3 41 5.6 4 42    Week 4 6 4 43 6.1 5 44 6.2 6 45 6.3 7 46 6.4 8 47 6.5 9 48 6.6 10 49    Week 5 7 11 50 7.1 11 51 7.2 12 52 7.3 12 53 7.4 13 54 7.5 14 55 7.6 15 56    Week 6 8 17 57 8.1 18 58 8.2 19 59 8.3 20 60 8.4 21 61 8.5 22 62 8.6 22 63    Week 7 9 23 64 9.1 24 65 9.2 26 66 9.3 27 67 9.4 28 68 9.5 29 69 9.6 31 70    Week 8 10 34 71 10.1 36 72 10.2 37 73 10.3 38 74 10.4 39 75 10.5 39 76 10.6 40 77    Week 9 11 44 78 11.1 45 79 11.2 47 80 11.3 48 81 11.4 52 82 11.5 55 83 11.6 56 84    Week 10 12 57 85 12.1 58 86 12.2 60 87 12.3 61 88 12.4 63 89 12.5 64 90 12.6 65 91    Week 11 13 68 92 13.1 70 93 13.2 72 94 13.3 74 95 113.4 76 96 135 77 97 13.6 80 98    Week 12 14 81 99 14.1 84 100 14.2 85 101 14.3 86 102 14.4 87 Reference: Table data measured by ultrasound, adapted from Westerway (2015) PDF and Links: ultrasound | Fetal Development