Main use of obstetric ultrasound
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1. Diagnosis of early pregnancy
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visualization of: gestational sac(4.5 wks), yolk sac (5 wks), embryo (5.5 wks)
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2. Vaginal bleeding in early pregnancy
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determines the viability of fetus, 83% survival of fetus if heart beat detected in 6-7 wks
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3. Determination of fetal age and size
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Crown-rump length (7-13wks), Biparietal diameter (13wks +), others femur length, abdominal circumference
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4. Diagnosis of fetal malformation
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fetal malformations can be detected before 20wks gest. age. (i.e. abnormal nasal bone, cleft lips,
congenital cardiac malformations, spina bifida etc.)
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determines site of placenta, borders, and placental abnormalities (i.e. placenta previa, fetal hydrops
etc.)
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