Napolitano R, Dhami J, Ohuma EO, Ioannou C, Conde-Agudelo A, Kennedy SH et al. Pregnancy dating by fetal crown-rump length: a systematic review of charts. BJOG 2014, 121(5):556-5.

doi: 10.1111/1471-0528.12478 


Papageorghiou AT, Kemp B, Stones W, Ohuma EO, Kennedy SH, Purwar M et al. Ultrasound based gestational age estimation in late pregnancy. Ultrasound Obstet Gynecol 2016. 48(6):719-26 

doi: 10.1002/uog.15894 


Tables & Graphs

Crown-rump length dating in early pregnancy:

Table (Centiles)

Tables and charts will also be made available in French, Italian, Portuguese and Spanish.

Calculators &

Excel-based Gestational Age Assessment Calculator



Training & Resources  



→Study Protocol 

→Correct measurement of CRL and standardisation manual