[Antenatal assessment of gestational age (author's transl)].

Antenatal assessment of fetal gestational age has been performed by amniotic fluid analyses and ultrasonography. Average estimation of amniotic fluid creatinine and glucose, Clements' test and biparietal diameter measurements produce an accurate assessment of gestational age in 80 % of normal or pathological cases. When amniocentesis is performed to estimate fetal lung maturity, this assessment of gestational age can improve obstetrical care.