Investigating the relationship between Vitamin D level and Polycystic ovarian syndrome- A case control study

Accurate gestational age estimation improves other and foetal care. Most commonly employed fetal parameters for estimation of gestational age, intrauterine growth and fetal weight are biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC) and femur diaphysis length (FL). The objective of the present study was to evaluate the correlation of BPD and FL with gestational age in the population of Chhattisgarh state of India. In present study, 380 pregnant women of second and third trimester of pregnancy with known last menstrual period (LMP) had undergone routine ultrasonography for evaluation of Biparietal Diameter and Foetal Length. Biparietal Diameter and Foetal length was noted and correlation with gestational age was calculated. We observed a total of 158 cases in 2nd trimester and 220 cases were in 3rd trimester of pregnancy and they were aged between 18 and 35 years (two cases excluded). Mean of Biparietal diameter and FL observed was 73.1mm (±12.8 standard deviation and 11.6 standard error) and 56.2 (±0.63 standard deviation and 0.57 standard error) respectively. There was a strong positive correlation between gestational age and BPD (0.980). Correlation was maximum between 20 to 24 weeks of gestation (r=0.987) and minimum between 35 to 38 weeks of gestation (r=0.947). Ultrasonographic measurements of BPD and FL corelates with gestational age in second and third trimester (r value 0.980, 0.987 for, BPD and FL respectively). Correlation between Biparietal Diameter (BPD) and Gestational age consequently decreases according to gestation age from 20 weeks to 38 weeks. Correlation is maximum between.