34 weeks biparietal diameter standard

Biparietal diameter is also known as fetal head biparietal diameter, which refers to the widest distance between the two sides of the fetal head. Generally, the standard value of biparietal diameter is 8.61 ± 0.63 cm at the 34th week of pregnancy. After that, with the increase of the number of weeks of pregnancy, the standard value of fetal biparietal diameter is 9.28 ± 0.50 cm at the 40th week of pregnancy.