A total of 4,823 births which occurred after 28 completed weeks of gestation at Han-Il hospital from September, 1993 to February, 1994 were studied and divided to 3 groups. The group I consisted of 419 women who had irregular menstruation,
unknown
last
men strual period, pregnancy during amenorrhea after delivery of D/E and whose USG findings at first antenatal check were more than 26 completed weeks of gestation. The group Il consisted of 2,848 women who had regular menstruation, accurate last
menstrual period and whose USG findings at first antenatal check were more than 26 completed weeks of gestation. The group III consisted of 1,556 women who had serial USG before 26 completed weeks of gestation irrespective of menstrual history.
The results obtained in this study were that gestational age, incidence of postterm pregnancy, induction rate and induction-failure rate of group III were significantly lower than those. Of group II.
It can be concluded that the gestational age from the early USG is clinically more important than that from last menstrual period.
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