Chema Nieto Castañón Oct 26, 2020:

Not sure why the different names in Spanish (I am familiar with longitud cráneo-caudal or cefalocaudal), but longitud cráneo-raquis is understandable as it describes what is measured, this is, both the cranium lenght and the vertebral column or rachis lenght -rather than stating the initial and end points of the given measure. And so, yes, crown-rump lenght it is.

Thomas Walker Oct 23, 2020:

Another source My other standard source for Spanish-English medical acronyms is, of course, Cosnautas.com. They have CRL #7: longitud cráneo-raquis {→ LCC 10}. LCC #10 has: longitud craneocaudal (o cefalocaudal) || ≡ LCR (longitud cráneo-raquis).
I don't know if the use of the different variants is a function of geography (Spain vs. the Americas?) or some other factor(s).

Thomas Walker Oct 23, 2020:

Raquis? Raquis in this connection is a little confusing to me. The base meaning of raquis seems to be more like spine, or DLE has "columna vertebral".
Ian Beattie has Spanish LCR, "longitud craneo-rabadilla," = English "crown-rump length," CRL. But then he also has Spanish "CRL," "longitud craneo-nalga," "longitud cráneo-raquis," "longitud céfalocaudal," & "longitud vértice-nalgas" = English "crown-rump length," CRL.

Wendy Cummings Oct 23, 2020:

Acronyms source This contains a useful list of acronyms used in foetal morphology scans
https://www.supersonicimagine.com/content/download/3483/2102...

Leo Viëtor Oct 23, 2020:

CRL o crown-rump length en inglés I think so. I couldn't find it either. Other spanish terms in use: Longitud céfalo-caudal
Longitud coronilla-rabadilla. The results of this echo are used to estimate how long the woman has been pregnant.

https://semanas.elembarazo.net/longitud-cefalo-caudal-crl.ht...
https://www.proz.com/kudoz/english-to-spanish/biology-tech-c...

Laura Gómez (asker) Oct 23, 2020:

Could it be this??
CRL (crown-rump length), the length from the top of the head to your baby's bottom, measurement taken in the first trimester