What should the fundal height be at 18 weeks of pregnancy to be considered normal?

Patient's question:

No.

Doctor's answer:

The average biparietal diameter (BPD) of the fetus at 22 weeks of gestation is 5.45 ± 0.57 cm; the femur length is 3.82 ± 0.47 cm; the average abdominal circumference is 16.70 ± 2.23 cm. The reference range for uterine height at 22 weeks of gestation is 18-22.5 cm.