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Table 3 Prediction equations for gestational age (in days) from measured variables (in mm)

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

Gestational sac (GS):
GA (day) = 6.687 + 1.395(GS) - 0.4391(GS)2 + 0.09837(GS)3 - 0.007091(GS)4
R2 = 0.9683
Crown-rump length (CRL):
GA (day) = 7.622 + 0.5264(CRL) + 0.009440(CRL)2 - 0.0005539(CRL)3
R2 = 0.9693
Biparietal diameter (BPD):
GA (day) = 8.195 + 0.8689(BPD) + 0.08056(BPD)2
R2 = 0.9648
Abdominal circumference (AC):
GA (day) = 7.645 + 0.8774(AC) - 0.07917(AC)2 + 0.004024(AC)3 - 6.508e-5(AC)4
R2 = 0.9698
Femur length (FL):
GA (day) = 12.24 + 3.822(FL) - 0.5103(FL)2
R2 = 0.8287
Lens diameter (LD):
GA (day) = 11.96 - 84.88(LD) + 1470(LD)2 - 4625(LD)3
R2 = 0.7582
  1. GA, gestational age