International Journal of Infertility & Fetal Medicine

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VOLUME 7 , ISSUE 2 ( May-August, 2016 ) > List of Articles

RESEARCH ARTICLE

Sonographic Correlation of Gestational Age with Fetal Kidney Length

Sandhya Hemraj, Sally M Abraham, US Vinayaka, G Ravichandra, Devdas Acharya

Citation Information : Hemraj S, Abraham SM, Vinayaka U, Ravichandra G, Acharya D. Sonographic Correlation of Gestational Age with Fetal Kidney Length. Int J Infertil Fetal Med 2016; 7 (2):37-41.

DOI: 10.5005/jp-journals-10016-1125

License: CC BY-NC 4.0

Published Online: 01-08-2016

Copyright Statement:  Copyright © 2016; The Author(s).


Abstract

Background

Gestational age estimation is one of the most important information conveyed by a sonologist when performing an obstetric ultrasound examination. The traditional fetal biometric parameters, such as biparietal diameter (BPD), head circumference (HC), femur length (FL), and abdominal circumference become increasingly unreliable for accurate gestational age estimation with advancing pregnancy, especially in 3rd trimester. This study was conducted to assess the role of fetal kidney length (KL) as an alternate parameter to assess gestational age in 2nd and 3rd trimesters.

Aim

To assess relationship between sonographic gestational age and fetal KL between 18 and 39 weeks of gestation.

Settings and design

Prospective, cross-sectional, single operator study conducted over a period of 1 year in a medical college hospital.

Materials and methods

Three hundred singleton pregnant women between 18 and 39 weeks of gestation were subjected to antenatal ultrasound. In addition to routine fetal biometry, measurements of fetal KL were made by noting distance between upper and lower poles of each kidney on a sagittal section of the fetal abdomen. The right and left KLs were averaged to obtain a single value for the purpose of statistical analysis.

Statistical analysis

Statistical analysis is done using SAS 9.2, SPSS 15.0, Stata 10.1, Med Calc 9.0.1, Systat 12.0, and R environment version 2.11.1. Fetal KL was expressed as mean ± standard deviation. Linear regression analysis was used to establish a relationship between sonographic gestational age in weeks and fetal KL. Level of significance was expressed as p value.

Results

A strong statistical correlation was found between sonographic gestational age and fetal KL. Nomograms and growth curves were constructed to correlate gestational age with fetal KL.

Conclusion

Fetal KL measurements can be used as alternate method of estimating gestational age in women with uncertain last menstrual periods (LMPs) and presenting late in the gestation for safe confinement. In fetal macrocephaly, hydrocephalus, short-limb dysplasias, and when fetal head is engaged, these measurements are valuable alternate parameters to assess gestational age since they are simple, not time-consuming, easy to identify, and measure.

How to cite this article

Hemraj S, Abraham SM, Acharya D, Ravichandra G, Vinayaka US. Sonographic Correlation of Gestational Age with Fetal Kidney Length. Int J Infertil Fetal Med 2016;7(2):37-41.


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  1. Role of fetal kidney length in estimation of gestational age. JK Sci J 2012 Apr-Jun;14(2):65-69.
  2. GA assessment. II. Prediction from combined clinical observations. Am J Obstet Gynecol 1981 Aug 1;140(7):770-774.
  3. Accuracy of emergency physicians using ultrasound measurement of crown-rump length to estimate gestational age in pregnant females. Am J Emerg Med 2012 Oct;30(8):1627-1629.
  4. Fetal crown-rump length and estimation of gestational age in an ethnic Chinese population. Ultrasound Obstet Gynecol 2009 Feb;33(2):157-160.
  5. Assessment of gestational age by ultrasound. Glob Libr Women's Med 2008;ISSN:1756-2228:doi:10.3843/GLOWM.10206.
  6. Sonographic prediction of gestational age: accuracy of second-and-third trimester fetal measurements. Am J Roentgenol 1991 Dec;157(6):1275-1277.
  7. Nontraditional sonographic pearls in estimating gestational age. Semin Perinatol 2008 Jun;32(3):154-160.
  8. The significance of fetal sacral length in the ultrasonographic assessment of gestational age. Arch Gynecol Obstet 2011 May;283(5):999-1004.
  9. Nomograms of sonographic measurements throughout gestation of the fetal hard palate width, length and area. Ultrasound Obstet Gynecol 2004 Jul;24(1):35-41.
  10. Quantitative characterization of the growth of the fetal kidney. J Clin Ultrasound 1983 Sep;11(7):349-356.
  11. Determination of gestational age after the 24th week of gestation from fetal kidney length measurements. Ultrasound Obstet Gynecol 2002 Jun;19(6):592-597.
  12. Evaluation of the normal fetal kidney length and its correlation with gestational age. Acta Med Iran 2013 May 30;51(5):303-306.
  13. Glomerulogenesis: can it predict the gestational age? A study of 176 fetuses. Ind J Pathol Microbiol 2012 Jul-Sep;55(3):303-307.
  14. Nomogram for fetal kidney length. Bombay Hosp J 2009;51(2):155-162.
  15. Normal length of fetal kidneys: sonographic study in 397 obstetric patients. AJR Am J Roentgenol 1991 Sep;157(3):545-548.
  16. Fetal kidney length: can be a new parameter for determination of gestational age in 3rd trimester. TAJ 2007;20(2):147-150.
  17. Ultrasonographic anatomy and physiology of the fetal kidney. Anat Clin 1985;7(2):107-123.
  18. Kidney length in the newborn measured by ultrasound. Acta Paediatr Scand 1983 Nov;72(6):885-887.
  19. Allometric study of renal growth in human fetuses. Surg Radiol Anat 1989;11(1):29-31.
  20. Normal standards for kidney length in premature infants: determination with US. Radiology 1987 Jul;164(1):127-129.
  21. Ultrasonic evaluation of kidney length in term and preterm infants. Eur J Pediatr 1989 Nov;149(2):94-95.
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