Pregnancy ultrasound is really necessary in the diagnosis and monitoring of pregnancy, which has been recognized worldwide. However, when and how often ultrasound is enough and whether it is harmful to mother and fetus are questions that need to be answered.
Ultrasound in the first 3 months (from the last menstrual period to 14 weeks), allows to calculate gestational age, due date (usually about 3 days wrong), determine how many pregnancies, same egg or fraternal, normal fetus, live or stopped developing fetus, ectopic pregnancy, malformed fetus…; Ultrasound in the second 3 months (from the 15th week to the end of the 26th week) to investigate whether the pregnancy is abnormal or not, and at the same time can determine the baby’s sex; Ultrasound in the third trimester (from the 27th week to the end of pregnancy) to identify abnormalities that appear late in this period such as hydrocephalus (watery head), placental edema, determine fetal growth. Fetus, placenta status, estimate fetal weight, determine fetal health status before birth. Thus, for a normal pregnant woman, at least three ultrasounds are needed.
Although the great benefits that ultrasound brings in the diagnosis and monitoring of pregnancy have been recognized worldwide and there is no really convincing evidence about the risks posed by ultrasound, but people also there is a need to be seriously and properly aware of the possible risks associated with ultrasound.
Use of ultrasound should be limited during the first trimester of pregnancy and performed only when the potential benefits to pregnancy outweigh the risks. When having ultrasound for the first 3 months of pregnancy, the use of color Doppler and Doppler ultrasound should be avoided.
During pregnancy, if there is nothing abnormal, pregnant women only need to have 3 ultrasounds to know if the baby is healthy or has any abnormalities. In case the due date is full, but the pregnant woman still has no signs of labor, the 4th and 5th ultrasound can be performed to assess the fetal status, labor process, amniotic fluid volume, etc.
Ultrasound should not be used to determine sex because this process takes a long time, causing the mother to lie down for a long time during the ultrasound, leading to exposure to many radiations that can be harmful to both mother and baby.
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