[Determination of the gestational age in the 1st trimester of pregnancy by ultrasonic measurement of the echo of embryo].
D004622:Embryo, Mammalian; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D014463:Ultrasonography
Odredivanje gestacijske dobi u prvom tromjesecju ultrazvucnim mjerenjem odjeka embrija