Umbilical blood flow test

Umbilical blood flow examination is to determine the development of the fetus in the uterus, such as the presence of intrauterine growth retardation, to determine whether there is a tendency to develop hypertensive syndrome in pregnancy, to determine whether there is intrauterine hypoxia. Umbilical blood flow such as fetal chromosomal abnormalities and congenital malformations can sometimes exhibit abnormalities. Abnormal umbilical blood flow may also be related to developmental defects and histological abnormalities of the placenta. The normal value is related to the number of weeks of pregnancy. There are three main factors, the ratio of systolic blood pressure to diastolic blood pressure (S/D) of the fetal umbilical artery is the main index, and the S/D value of the late pregnancy is less than or equal to 3.0 as the normal value. Basic Information Specialist classification: maternity check check classification: ultrasound Applicable gender: whether women are fasting: not fasting Tips: Before the check, the taboo is poor, the diet is not proper, and the fatigue is excessive. Normal value The normal value of umbilical blood flow is 3.5 at 24 weeks, and the upper limit is 4.25, which is abnormal. Clinical significance Abnormal results: If the S/D and RI values ​​increase during the first stage of pregnancy from 26 to 28 weeks (S/D should be less than 3 after 28 weeks, RI should be less than 0.8), the main considerations should be: (1) Fetal malformation: fetal congenital disease is closely related to umbilical artery resistance, and should be further examined by B-ultrasound. (2) Umbilical cord abnormality: When the umbilical cord is entangled, too long or too short, and too fine to affect the placental circulation, the abnormality is the blood flow impedance index. If the S/D value is higher than the normal value, and the B-ultrasound shows abnormal conditions such as the umbilical cord around the neck, it should be closely observed according to the stage of pregnancy. (3) Placental dysfunction: The pathological changes of the placenta can reduce the volume of the placenta, reduce the total cross-sectional area of ​​the effective blood vessels, increase the blood flow resistance, and reduce the blood perfusion. (4) Intrauterine growth retardation (IUGR): There are many reasons for the occurrence of IUGR in pregnant women. In addition to factors such as genetic nutrition, harmful contact, malformation, and viruses, the proportion of IUGR due to pregnancy accessories such as placenta is increasing. , the performance of S / D, RI increased. After the second stage was monitored from 36 to 37 weeks, the umbilical artery blood flow impedance was divided into three levels: Grade 1: S/D value <3.0, umbilical artery blood flow impedance is at a normal level. Level 2: S/D value >3.0, but <4.0, will not cause acute fetal distress, should be treated in time to prevent the disease from worsening. Level 3: S/D values ​​> 4.0, which will lead to poor prognosis in perinatal. The third stage of umbilical artery impedance index during childbirth: There was no significant change in the S/D value during normal pregnancy in pregnant women. If the index is abnormal, the prognosis of perinatal is poor. If the diagnosis is abnormal for umbilical blood flow, it is best to monitor the fetal condition several times per day. If the abnormality of the umbilical blood flow is not very serious, it is recommended to take the left lateral position. If it does not improve, oxygen therapy is needed if necessary. People who need to be examined: older pregnant women and used to understand intrauterine growth restriction and pregnancy-induced hypertension. Precautions 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 detector is used to detect the blood flow of the umbilical artery on the side of the fetal limb. The built-in software automatically measures the impedance of the blood flow according to the measured S/D, PI, RI, and FUR blood flow indicators. Not suitable for the crowd No taboos. Adverse reactions and risks No complications.

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