Evaluation of the Normal Fetal Kidney Length and Its Correlation with Gestational Age

  • Farrokh Seilanian Toosi Mail Department of Radiology, Quaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran.
  • Hossein Rezaie-Delui Department of Radiology, Quaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran.
Anthropometry, Fetal Ultrasonography, Gestational Age, Kidney


A true estimation of gestational age (GA) plays an important role in quality maternity care and scheduling the labor date. This study aimed to evaluate the normal fetal kidney length (KL) and its correlation with GA. A cross-sectional study on 92 pregnant women between 8th and 10th week of gestation with normal singleton pregnancy underwent standard ultrasound fetal biometry and kidney length measurement. univariate and multivariate linear regression analysis was used to create a predictive equation to estimate GA on the KL and fetobiometry parameters. A significant correlation was found between GA and KL (r=0.83, P<0.002). The best GA predictor was obtained by combining head circumference, fetal biparietal diameter, femur length and KL with a standard error (SE) about 14.2 days. Our findings showed that KL measurements combination with other fetal biometric parameters could predict age of pregnancy with a better precision.


Wegienka G, Baird DD. A comparison of recalled date of last menstrual period with prospectively recorded dates. J Womens Health (Larchmt) 2005;14(3):248-52.

Waller DK, Spears WD, Gu Y, Cunningham GC. Assessing number-specific error in the recall of onset of last menstrual period. Paediatr Perinat Epidemiol 2000;14(3):263-7.

Bailey C, Carnell J, Vahidnia F, Shah S, Stone M, Adams M, Nagdev A. Accuracy of emergency physicians using ultrasound measurement of crown-rump length to estimate gestational age in pregnant females. Am J Emerg Med 2012;30(8):1627-9.

Sahota DS, Leung TY, Leung TN, Chan OK, Lau TK. Fetal crown-rump length and estimation of gestational age in an ethnic Chinese population. Ultrasound Obstet Gynecol 2009;33(2):157-60.

Karki DB, Sharmqa UK, Rauniyar RK. Study of accuracy of commonly used fetal parameters for estimation of gestational age. JNMA J Nepal Med Assoc 2006;45(162):233-7.

Lobo ML, Favorito LA, Abidu-Figueiredo M, Sampaio FJ. Renal pelvic diameters in human fetuses: anatomical reference for diagnosis of fetal hydronephrosis. Urology 2011;77(2):452-7.

Sampaio FJ. Theoretical kidney volume versus real kidney volume: comparative evaluation in fetuses. Surg Radiol Anat 1995;17(1):71-5.

Konje JC, Abrams KR, Bell SC, Taylor DJ. Determination of gestational age after the 24th week of gestation from fetal kidney length measurements. Ultrasound Obstet Gynecol 2002;19(6):592-7.

Bertagnoli L, Lalatta F, Gallicchio R, Fantuzzi M, Rusca M, Zorzoli A, Deter RL. Quantitative characterization of the growth of the fetal kidney. J Clin Ultrasound 1983;11(7):349-56.

Ozat M, Kanat-Pektas M, Gungor T, Gurlek B, Caglar M. The significance of fetal sacral length in the ultrasonographic assessment of gestational age. Arch Gynecol Obstet 2011;283(5):999-1004.

Sherer DM, Sokolovski M, Santoso PG, Dalloul M, Abulafia O. Nomograms of sonographic measurements throughout gestation of the fetal hard palate width, length and area. Ultrasound Obstet Gynecol 2004;24(1):35-41.

Kansaria J, Parulekar S. Nomogram for foetal kidney length. Bombay Hospital Journal 2009;51(2):155-62.

Al-Kubaisi SR. Anterior-posterior thigh diameter measured by two-dimensional sonography: indicator of fetal age at 18 to 28 weeks gestation ? Sultan Qaboos Univ Med J 2006;6(2):47-58.

Ismail SR. Can the anterior-posterior thigh diameter be used as an indicator for fetal age using two-dimensional sonography? The South African Radiographer 2007;45(1):14-8.

How to Cite
Seilanian Toosi F, Rezaie-Delui H. Evaluation of the Normal Fetal Kidney Length and Its Correlation with Gestational Age. Acta Med Iran. 51(5):303-306.