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Ultrasound (Abdominal, Transvaginal, and Doppler)

• When they are performed: Transvaginal ultrasounds are especially useful in the first trimester (or in the third trimester to evaluate preterm labor), as they do not require a full bladder. Abdominal ultrasounds are more useful after the first trimester when the uterus is larger.
• What they screen for: Ultrasounds confirm pregnancy, determine gestational age, identify multifetal pregnancies, evaluate fetal growth and position, and check for fetal viability or abnormalities. They also assess maternal structures and amniotic fluid volume. A Dop ...