Keywords: Crown-rump length by gestational age (vector).svg Crown-rump length by gestational age The blue line is the mean and the green area delimits the 3rd versus the 97th percentile cite journal Ohuma EO Papageorghiou AT Villar J Altman DG Estimation of gestational age in early pregnancy from crown-rump length when gestational age range is truncated the case study of the INTERGROWTH-21st Project BMC Med Res Methodol 13 151 2013 24314232 4029763 10 1186/1471-2288-13-151 <P>Crown rump length before a gestational age of 9 weeks is extrapolated by assuming a crown rump length of 0 at a gestational age of 2 weeks corresponding to a fertilization age of 0 weeks This extrapolated part is blurred because of uncertain values Mikael Häggström 2014-07-12 thumb left png-format Obstetrics Cc-zero |