A clinical study on correlation of fetal kidney length with gestational age in third trimester of pregnancy

Objectives: To study the correlation between fetal kidney length on ultrasonography (USG) and gestational age as well as validated with different biometric parameters of pregnant women presenting third trimester.Methodology: A cross-sectional study was performed among100 antenatal mothers of singleton pregnancies and parity who visited gynaecology and obstetrics OPD at IPGME&R & SSKM Hospital during the period of January 2019 to August 2020.The measurements of USG for foetal kidney length (FKL) and correlation with last menstrual period gestational age and other biometric indices viz.BPD, HC, AC and FL were evaluated.Results: The mean age of patients was 27.12 4.12 years was obtained.The mean SD values were recorded for POG by LMP (35.73 3.71 days), POG by DS (35.19 3.46 days), MKL (38.08 3.76 mm), BPD (33.75 2.60 mm), AC (33.38 2.18 mm), FL (34.03 2.40 mm), weight (233.93692.46 mm), HC (317.0423.67 mm), and AUA (33.88 2.45 days) among patients.The values of Pearson correlation coefficient (r) were observed significantly (p = 0.03 and 0.020) positive correlation between POG by LMP and DS vs MKL while BPD, AC, weight, and AUA were observed significantly (p = 0.009, p = 0.001, p = 0.007 and p = 0.037) positive correlation (0.260, 0.339, 0.195, 0.267, 0.092 and 0.209) except FL and HC did not show significant (p = 0.052 and p = 0.365) difference among patients.Conclusion: FKL is easy to identify and measure.It is the most accurate single parameter for estimating GA than other biometric indices especially in cases when the other parameters like BPD, AC and HC are not reliable for assessing GA in 3rd trimester of pregnancy.