Abstract

Background: Good Antenatal Care requires monitoring of pregnancy through meticulous history, examination and investigation. Ultasound is a non-invasive, safe, economical and easlily accessible test, routinely used to monitor Maternal and Foetal well-being. Vigilant obstetric care depends on accurate dating of pregnancy and timely interventions which are gestational age dependent. Gestational age is calculated from first day of last menstrual period to the current date (Naegle’s formula). Early pregnancy ultrasound using Gestational Sac Diameter (GSD) and CRL is accurate in dating pregnancy where a pregnant woman is not sure of menstrual cycles or the cycles are irregular.1 Sonographic Monitoring utilizes foetal biometry to study fetal anatomy through different parameters like Crownrump length (CRL), fetal bi-parietal diameters (BPD), head circumference (HC), abdominal circumference (AC), and femur length (FL) to determine gestational age (GA), fetal weight, and growth in different trimesters of pregnancy and to rule out the presence of congenital anomalies.2,3

There have been studies on BPD and assessment of gestational age, that have shown anthropological variations. Socioeconomic, demographic and environmental factors also play an important role in taking timely decisions which are dependent on correct gestational age

Aims and Objectives: This study aimed to ascertain correlation between BPD and gestational age in pregnant females visiting ANC OPD of Rural Health and Training Centre at Jawan, Aligarh.

Methodology: The study enrolled 100 consecuetive pregnant females attending ANC OPD of RHTC, Jawan, Aligarh. They had their routine antenatal ultrasound, which were assessed for the BPD data.

Inclusion Criteria: Study included pregnant females without any medical conditions that can complicate the pregnancy.

Exclusion Criteria: Refusal of consent, twins, medical disorders of pregnancy, congenital anomalies

Conclusion: This study was done in North India rural population with the mean age of pregnant females of 26 years. It showed a linear correlation between BPD and gestational age. BPD was found to have a positive correlation with gestational age especially in second trimester. The accuracy in predicting gestational age declines with the advancing gestation. Thus, ultrasonographic measurement of biparietal diameter can be used to used to predict gestational age in Indian foetuses.

• 1.   Kalish RB, Chervenak F Sonographic determination of gestational age. Ultrasound Rev Obstet Gynecol 2005: 4;254–8.
• 2.   Sadler TW ed. Langman’s Medical Embryology. 11th ed (South Asian Edition). New Delhi: Wolters Kluwer (India) Pvt Ltd/Lippincott Williams & Wilkins; 2010. 95.
• 3.   Pandey VD, Singh V, Nigam GL, Usmani Y, Yadav Y Fetal tibial length as a tool for assessment of gestational age –A comparative study in North India. IAIM 2015: 2;39–45.
• 4.   Kramer MS, Mclean FM,Boyd ME,Usher RH. The validity of gestational age estimation by menstrual dating in term, preterm, and postterm gestation. JAMA 1988;260;3306 Effect of antenatal corticosteroid administrationto-birth interval on maternal and newborn outcomes: a systematic review. McDougall, Annie R.A. et al. eClinical Medicine, Volume 58, 101916.
• 6.   Kramer MS, Mclean FM, Boyd ME, Usher RH. The validity of gestational age estimation by menstrual dating in term, preterm, and postterm gestation. JAMA 1988;260;3306.
• 7.   Campbell S The prediction of fetal maturity by ultrasonic measurement of the biparietal diameter. J Obstet Gynaecol Br Commonw 1969: 76;603–9.
• 8.   Quddusa S, Chowdhury S Estimation of gestational age by foetal biparietal diameter in Bangladesh. J Bangladesh Coll Phys Surg 2004: 22;53–6.
• 9.   Beigi A, ZarrinKoub F Ultrasound assessment of fetal biparietal diameter and femur length during normal pregnancy in Iranian women. Int J Gynaecol Obstet 2000: 69;237–42.
• 10.   Dr Faiza Naseem Dr Sabir Ali, Dr Umbreen Basit, Dr Naheed Fatima. Assessment of gestational age comparison between transcerebellar diameter versus femur length on ultrasound in 3rd trimesterof pregnancy. Professional Medical J. 2014; 2:412-417.
• 11.   Cohen HL, Cooper J, Eisenberg P, Mandel FS, Gross BR, Goldman MA, et al. Normal length of fetal kidneys: Sonographic study in 397 Obstetrics patients. Am J Roentol. 1991;157(3):545–8.
• 12.   Schlesinger A, Hedlund G, Pierson WP, Null DM. Normalstandards for kidney length in premature infants. Determination with US. Radiology. 1987;164:127–9.
• 13.   Gloor JM, Breekle RJ, Gehrking WC, Rosenquist RG, Mulhelland TA, Bergstrakh EJ, et al. Fetal renal growth evaluated by prenatal ultrasound examination Mayo Clin Proc. 1997; 72(2):124– 9. doi:10.4065/72.2.124.
• 14.   Sagi J, Vagman I, David MP, Dongen LGV, Gondie E, Butterworth A, et al. Fetal kidney size related to gestational age. Gynecol Obstet Invest. 1987;23(1):1–4.
• 15.   Haldlock FP, Deter RL, Harrist RB, Park SK. Estimating Fetal age: Computer assistedanalysis of multiple fetal growth parameters. Radiology 1984; 152(2):497-501.
• 16.   Haldlock FP. Determination of fetal age. In Athey P.A and Haldlock, F.P. Mosby Ultrasound in Obstetrics and Gynecology 1985.
• 17.   Singh, Archana; Gupta, Rakesh; Singh, Arun1. Ultrasonographic Analysis of Biparietal Diameter as an Indicator of Gestational Age in North Indian Fetuses. Journal of the Anatomical Society of India 72(2):p 158-168, Apr–Jun 2023. | DOI: 10.4103/jasi.jasi_116_22.
• 18.   Agrawal NL Correlation of gestational age by real time ultra sonographic measurement of fetal Biparietal Diameter (BPD) with existing standard normograms. Indian J Appl Res 2015: 5;79–99

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