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. 2021 Aug 27;4(3):58. doi: 10.3390/mps4030058

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Ultrasound images of the guinea pig pregnancy. The earliest time to reliably detect a guinea pig pregnancy using an ultrasound is approximately gestational day 21, in which the most obvious signs of a fetus are the amniotic cavity and placenta (A). By mid-gestation (gestational day 30–35) the placenta and sub-placental region are visible along with the fetus (B) including a clear identification of the fetal heart (C). The black arrow identifies the developing fetus, pointing to the fetal heart in (C). The red outline indicates the placenta.