Background: Crown Rump Length (CRL) is the measurement of the length of human embryo or fetus from top of the head to bottom of the buttock. Gestational age assessment by ultrasound is most accurate in the first trimester of pregnancy. CRL measurement is used to determine the gestational age. The aim of the present study is to find the correlation between first trimester Crown-Rump Length and the birth weight of neonate.
Materials and Methods: 100 women with singleton pregnancy, who attended antenatal OPD in first trimester in our hospital, were included in this study after informed consent. First trimester ultrasound measurement of Crown rump length was done. For the optimal accuracy, the average of three independent CRL value was taken for the study. They were followed up until delivery and the neonatal birth weight was noted. The data were analysed using mean, standard deviation, Pearson correlation coefficient and chi-square test.
Results: The mean age of the study population was 25.24± 3.4 years. The mean crown rump length was 3.5±2.07 and the mean birth weight was 2.9± 0.51. There was significant correlation between the first trimester crown rump length and gestational age in this study. But there was no significant correlation between crown rump length and neonatal birth weight.
Conclusion: Hence we recommend further more research in this field in large population to find the correlation between crown rump length and birth weight, so that earlier and timely intervention can minimize the adverse neonatal outcome such as low birth weight.