Noninvasive Ultrasound Monitoring of Embryonic and Fetal Development in Chinchilla lanigera to Predict Gestational Age: Preliminary Evaluation of This Species as a Novel Animal Model of Human Pregnancy

Table 3

Morphometric evaluation (in mm).

Type of measurement	Measurement at the beginning of pregnancy (mean ± SD)	Measurement at the end of pregnancy (mean ± SD)
Longitudinal sac diameter	11.7 ± 1.6 (E15)	23.9 ± 2.9 (E49)
Transversal sac diameter	8.9 ± 2.0 (E15)	18.6 ± 1.8 (E49)
Placental diameter	8.3 ± 0.6 (E15)	20.5 ± 5.6 (E107)
Placental thickness	4.1 ± 0.5 (E15)	13.6 ± 2.4 (E107)
Lens diameter	1.4 ± 0.3 (E60)	2.2 ± 0.8 (E107)
Eye axis	3.2 ± 0.6 (E55)	4.9 ± 1.2 (E107)
Head diameter	2.6 ± 0.7 (E31)	16.4 ± 1.7 (E107)
Occipital to snout length	5.0 ± 0.4 (E40)	26.9 ± 5.2 (E107)
Heart rate (BPM)	154 ± 13.8 (E31)	138 ± 39 (E107)
Stomach diameter	3.7 ± 1.0 (E55)	7.3 ± 2.1 (E107)
Body diameter (long axis)	8.5 ± 2.2 (E38)	19.0 ± 4.3 (E107)
Femur length	9.4 ± 0.7 (E66)	14.5 ± 4.3 (E107)
Crown-rump length	7.1 ± 3.3 (E31)	27.0 ± 7.8 (E70)

BPM: beats per minute.