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Table 1 Prediction equations for growth parameters (in mm) as a function of gestational age (in days)

From: In vivo quantification of embryonic and placental growth during gestation in mice using micro-ultrasound

Gestational sac (GS):
GS = -9.66 + 1.40(GA)
R2 = 0.9602
Crown-rump length (CRL):
CRL = -9.42 + 1.09(GA) + 0.0281(GA)2
R2 = 0.9682
Biparietal diameter (BPD):
BPD = 50.47 - 17.14(GA) + 2.07(GA)2 - 0.103(GA)3 + 0.00186(GA)4
R2 = 0.9733
Abdominal circumference (AC):
AC = -55.75 + 7.52(GA) - 0.166(GA)2
R2 = 0.9723
Femur length (FL):
FL = -5.02 + 0.392(GA)
R2 = 0.8215
Lens diameter (LD):
LD = 2.205 - 0.518(GA) + 0.0401(GA)2 - 0.000856(GA)3
R2 = 0.9618
Body weight (BW):
BW = 0.5488 - 0.01714(GA) - 0.01180(GA)2 + 0.0008279(GA)3
R2 = 0.9906
Placental diameter (PD):
PD = -11.96 + 2.09(GA) - 0.046(GA)2 - 0.0005(GA)3
R2 = 0.8941
Placental thickness (PT):
PT = 4.10 - 1.14(GA) + 0.115(GA)2 - 0.0031(GA)3
R2 = 0.7562
Placental weight (PW):
PW = -0.54180 + 0.07887(GA) - 0.002243(GA)2
R2 = 0.8237
  1. GA, gestational age