Umbilical artery S / D
The ratio of fetal umbilical artery systolic blood pressure to diastolic blood pressure is the umbilical artery S / D, which is related to fetal blood supply. This ratio will be abnormal when the placenta is not functioning or the umbilical cord is abnormal. Decreased, D increased, the ratio decreased, S / D is less than 3 in near term pregnancy.
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