title: [Determination of birth date by early ultrasonography].
abstract: Ultrasound examination has become an indispensable tool in antenatal care. In cases with intrauterine growth retardation, post-term pregnancy and when deciding elective delivery, knowledge about gestational age is essential. However, criticism has been raised against its routine use to determine gestational age. Ultrasound is subject to a certain degree of variation, as is determination of gestational age on the basis of the last menstrual period. Variation is less by ultrasound, which therefore reduces the number of "post-term" pregnancies. The consequences of post-term pregnancy are discussed.
authors.affiliation: Kvinneklinikken Rikshospitalet, Oslo.
authors.forename: E
authors.initials: E
authors.lastname: Børdahl
authors.forename: N
authors.initials: N
authors.lastname: Moe
mesh_terms: D005260:Female; D005865:Gestational Age; D006801:Humans; D007743:Labor, Obstetric; D011247:Pregnancy; D011273:Pregnancy, Prolonged / Q000502:physiology; D016216:Ultrasonography, Prenatal
vernacular_title: Bestemmelse av fødselstermin ved tidlig ultralydundersøkelse.