Fertilization Age

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Fertilization Age (FA) is a biological term usually given in weeks and/or days to describe human development timed from the day of fertilisation in research materials timed from fertilization (fertilization age or conceptional age). In all other species, other than human, this is how development is normally measured or timed. These terms are not generally used clinically.


Cestational Age (GA), or menstrual age, is the human clinical term usually given in weeks and days to describe human development timed from the first day of the last menstrual period (LMP). For gestational age in assisted reproductive technology pregnancy 2 weeks are added to the fertilisation date.


Note - This current website preferentially uses the approximate fertilization age, except for some clinical presentations, and may also list the GA.


A template link from the FA acronym brings readers to this current page, use your browser back button to return to the original page.


Links: Timeline human development | Menstrual Cycle | Week 1 | Assisted Reproductive Technology | Birth


Crown Rump Length

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[1]
Links: ultrasound | Fetal Development

References

  1. Westerway SC, Davison A & Cowell S. (2000). Ultrasonic fetal measurements: new Australian standards for the new millennium. Aust N Z J Obstet Gynaecol , 40, 297-302. PMID: 11065037


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Cite this page: Hill, M.A. (2019, July 19) Embryology Fertilization Age. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Fertilization_Age

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© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G