Table 2—

Fetal ultrasonographic parameters

22 weeks28 weeks32 weeks36 weeks
Biparietal diameter (mm)56.0 ± 2.971.5 ± 3.982.2 ± 2.689.0 ± 2.2
Head circumference (mm)199.1 ± 9.8264.2 ± 9.5294.9 ± 10.3322.5 ± 8.3
AC (mm)181.1 ± 9.9242.9 ± 10.1279.1 ± 11.0310.8 ± 14.1
HC:AC ratio1.09 ± 0.981.08 ± 0.941.05 ± 0.931.03 ± 0.58
Femur length (mm)39.0 ± 3.054.9 ± 1.963.8 ± 1.871.1 ± 1.5
  • Data are means ± SD.