Ultrasonic assessment of the high rate of human multiple pregnancy in the first trimester.
The ultrasonic examination of 6,690 pregnant patients showed a greater number of multiple pregnancies than usually observed at delivery: 71 per cent of twin gestations diagnosed before 10 weeks were singletons when delivered.
D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011272:Pregnancy, Multiple; D014427:Twins; D014463:Ultrasonography