Zunaira Sarwar, Syed Amir Gilani, Romana Latif, Faisal Nadeem Khan, Nawaz Anjum.
Sonographic Estimation of Gestational age by Umbilical Cord Diameter and its Relationship with Bi-Parietal Diameter and Femur Length in Second and Third Trimester in Lahore, Pakistan.
Pak J Med Health Sci Jan ;12(2):514-6.

Background: Umbilical cord is an intra-amnioticstructure through which fetus is connected to the placenta. Accurate estimation of gestational age of fetus is very important for obstetricians and radiologists. Ultrasound is primary imaging modality used by which we can accurately determine or predict the age of fetus. In this study umbilical cord diameter of fetus in 2nd and 3rd trimester is noted, BPD & FL are also noted and the findings are then related with each other. Aim: To estimate the gestational age measured by Umbilical cord diameter and its relationship with bi-parietal diameter and femur length in second and third trimester by ultrasound. Methodology: A cross-sectional study of 384 pregnant females was conducted in their 2nd and 3rd trim ester by using simple random sampling technique. This study was done in Radiology Department of Shalamar Hospital Lahore, Pakistan. MINDRAY Ultrasound machine was used with 3.5 MHz convex transducer. Results: The results of study showed that a significant correlation is observed between umbilical cord diameter and gestational age measured by BPD and FL in 2nd and 3rd trimester of pregnancy. Correlation coefficient measured by umbilical cord diameter & gestational age measured by BPD & FL are 0.953 and 0.953 respectively. Conclusions: Umbilical cord diameter is a useful parameter for estimation of gestational age. Gestational age measured by BPD and FL in 2nd and 3rd trimester is related to umbilical cord diameter.

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