Crown-Rump Length: Difference between revisions
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==Introduction== | ==Introduction== | ||
[[File:Stage13 crown rump length.jpg|thumb|150px|alt=Crown-rump length|Crown-rump length Human embryo ([[Carnegie stage 13|stage 13]])]] | [[File:Stage13 crown rump length.jpg|thumb|150px|alt=Crown-rump length|Crown-rump length Human embryo ([[Carnegie stage 13|stage 13]])]] | ||
(CRL | ({{CRL}}) 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 {{GA}} gestational age. | Used in clinical [[ultrasound]] as a measurement between the periods of 7 to 13 weeks as an accurate estimation of the {{GA}} gestational age. | ||
:'''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]] |
Revision as of 10:42, 24 April 2018
Embryology - 18 Apr 2024 Expand to Translate |
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Introduction
(CRL) 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 GA gestational age.
- Links: Embryonic Development | Carnegie Stage Comparison | Carnegie Institution - Contributions to Embryology | Human Embryo Collections
Ultrasound CRL
Note that clinical GA gestational age is about 2 weeks more than the fertilisation age.
Fertilization and Gestational Age - Crown-Rump Length (ultrasound) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Gestational Age and Crown-Rump Length (measured by ultrasound) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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- Links: CRL-GA Table | FA-GA-CRL
Historic Embryo CRL
Mall (1918)[2] | Streeter (1920) Graph of embryo CRL[3] |
Fetal CRL
Third Trimester CRL
References
- ↑ 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
- ↑ Mall FP. On the age of human embryos. (1918) Amer. J Anat. 23: 397-422.
- ↑ 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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Search Pubmed: Crown-Rump Length | Crown Rump Length
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Cite this page: Hill, M.A. (2024, April 18) Embryology Crown-Rump Length. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Crown-Rump_Length
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G