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Veterinary Medicine International
Volume 2012 (2012), Article ID 850867, 6 pages
Research Article

Ultrasound Determination of Gestational Age Using Placental Thickness in Female Dogs: An Experimental Study

1Department of Imaging Diagnostic, Federal University of São Paulo (UNIFESP), 05303-000 São Paulo, SP, Brazil
2Department of Obstetrics, Federal University of São Paulo (UNIFESP), 05303-000 São Paulo, SP, Brazil

Received 12 March 2012; Revised 16 May 2012; Accepted 16 May 2012

Academic Editor: Remo G. Lobetti

Copyright © 2012 André Luiz Louzada Maldonado et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Objective. To verify if the placental thickness allows determining the gestational age, evaluating the correlation between the referred gestational age with the studied one, and the accuracy of the placental thickness measurement (biometry) with fetal morphologic parameters in bitches. Methods. The placental thickness of 336 bitches of diverse breeds was evaluated. Bitches were divided in three groups by body weight: small, medium, and big large size. The gestations pregnancies were evaluated by ultrasound from the third week of gestation. An analysis was performed between the mean values of the gestational age obtained of placental thickness by adjustment of curves and the reported gestational age. Student's t-test was applied to compare the mean of reported and placental thickness gestational age. Significance was defined as 𝑃 < 0 . 0 5 . Results. A positive and statistically significant correlation exists between the placental thickness and gestational age. The expression that presents the best correlation coefficient and explanation was thickness of placenta = 0.021 𝑥 gestational age −0.314. Conclusion. It is possible to determine the gestational age in relation to the placental thickness measured by ultrasound in bitches with a satisfactory accuracy in relation to fetal morphologic parameters as gestational vesicle, ribs, or kidneys.