The ratio of fetal umbilical artery systolic to diastolic blood pressure

The ratio of systolic blood pressure to diastolic blood pressure in the umbilical artery is the umbilical artery S/D, which is related to fetal blood supply. When the placental dysfunction or umbilical cord is abnormal, the ratio will be abnormal. In normal pregnancy, the fetus needs to increase with the gestational age. Decline, D rises, the ratio decreases, S/D is less than 3 in near term pregnancy. The umbilical artery blood flow is detected on the side of the fetal limb using the umbilical artery blood flow detector, and the built-in software can measure the S/D. Basic Information Specialist classification: maternity check check classification: ultrasound Applicable gender: whether women are fasting: fasting Tips: Actively cooperate with the doctor's work. Normal value In normal pregnancy, the S/D ratio of the venous catheter decreases with increasing gestational age, from about 3 in 14 weeks of gestation to about 2 in 42 weeks of gestation. S/D is about 3.5~5.5 before 24 weeks of gestation, generally not more than 5.5. 24~30 weeks S/D=2.5~5.0, generally no more than 5. 30~36 weeks S/D=2.5~4, generally no more than 4. 36~40 weeks S/D=1.7~3, generally no more than 3. Clinical significance Abnormal results: The ratio of fetal umbilical arterial systolic pressure to diastolic blood pressure reflects the delivery of oxygen in the placenta. If this value is abnormally elevated, the most important consequence is the intrauterine hypoxia. The cause of abnormal elevation may be elevated placental resistance or abnormal umbilical cord. People who need to be examined: the lack of oxygen in the fetus and the people who need to have a fetal development check. High results may be diseases: Precautions for fetal growth restriction Taboo before the examination: poor rest, improper diet, excessive fatigue. Requirements for inspection: Actively cooperate with the doctor's work. Inspection process The umbilical artery blood flow is detected on the side of the fetal limb using the umbilical artery blood flow detector, and the built-in software can measure the S/D. Not suitable for the crowd No taboos. Adverse reactions and risks No complications.