Crown-Rump Length: Difference between revisions

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:'''Links:''' [[Embryonic_Development|Embryonic Development]] | [[Carnegie Stage Comparison]] | [[Book_-_Contributions_to_Embryology|Carnegie Institution - Contributions to Embryology]] | [[Human Embryo Collections]]  
:'''Links:''' [[Embryonic_Development|Embryonic Development]] | [[Carnegie Stage Comparison]] | [[Book_-_Contributions_to_Embryology|Carnegie Institution - Contributions to Embryology]] | [[Human Embryo Collections]]  
==Embryo CRL==
 
==Ultrasound CRL==
{{CRL-GA Collapse Table}}
 
{{FA-GA-CRLCollapse Table}}
 
[[:Template:CRL-GA Table|CRL-GA Table]] | [[:Template:FA-GA-CRLCollapse Table|FA-GA-CRL]]
==Historic Embryo CRL==
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{|
| [[File:Mall1918-fig01.jpg|400px]]
| [[File:Mall1918-fig01.jpg|400px]]
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==Fetal CRL==
===Fetal CRL===
[[File:Keibel Mall 144.jpg|thumb|Human Embryo No. 131 90 mm CRL]]
[[File:Keibel Mall 144.jpg|thumb|Human Embryo No. 131 90 mm CRL]]
[[File:Fetal length change.jpg|500px]]
[[File:Fetal length change.jpg|500px]]

Revision as of 08:37, 29 April 2017

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Introduction

Crown-rump length
Crown-rump length Human embryo (stage 13)

(CRL, greatest length, GL) A measurement used in embryology to more accurately stage the early embryo, also historically called the "greatest length" (GL). Measured from the curvature at the top (crown) to the curvature at the bottom (rump) of the "C-shaped" early embryo.


Used in clinical ultrasound as a measurement between the periods of 7 to 13 weeks as an accurate estimation of the gestational age.


Links: Embryonic Development | Carnegie Stage Comparison | Carnegie Institution - Contributions to Embryology | Human Embryo Collections

Ultrasound CRL

Gestational Age and Crown-Rump Length (measured by ultrasound) 
Gestational Age
GA (week.day) 		Crown-Rump
Length (CRL)
5.2 1
5.3 2
5.4 3
55 3
5.6 4
6 4
6.1 5
6.2 6
6.3 7
6.4 8
6.5 9
6.6 10
7 11
7.1 11
7.2 12
7.3 12
7.4 13
7.5 14
7.6 15
8 17
8.1 18
8.2 19
8.3 20
8.4 21
8.5 22
8.6 22
9 23
9.1 24
9.2 26
9.3 27
9.4 28
9.5 29
9.6 31
10 34
10.1 36
10.2 37
10.3 38
10.4 39
10.5 39
10.6 40
11 44
11.1 45
11.2 47
11.3 48
11.4 52
11.5 55
11.6 56
12 57
12.1 58
12.2 60
12.3 61
12.4 63
12.5 64
12.6 65
13 68
13.1 70
13.2 72
13.3 74
113.4 76
135 77
13.6 80
14 81
14.1 84
14.2 85
14.3 86
14.4 87
Reference

Table adapted from Westerway (2015) PDF and <pubmed>11065037</pubmed>

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

CRL-GA Table | FA-GA-CRL

Historic Embryo CRL

Mall1918-fig01.jpg Streeter1920chart1.jpg
Mall (1918)[2] Streeter (1920) Graph of embryo CRL[3]

Fetal CRL

Human Embryo No. 131 90 mm CRL

Fetal length change.jpg

Third Trimester CRL

Third trimester Crown-Rump Length graph.jpg

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
  2. ↑ Mall FP. On the age of human embryos. (1918) Amer. J Anat. 23: 397-422.
  3. ↑ Streeter GL. Weight, sitting height, head size, foot length, and menstrual age of the human embryo. (1920) Contrib. Embryol., Carnegie Inst. Wash. Publ. , : 143-170.

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Cite this page: Hill, M.A. (2024, April 24) Embryology Crown-Rump Length. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Crown-Rump_Length

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
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