Patient's question:
Description of the condition (onset time, main symptoms, changes in symptoms, etc.): When is it most appropriate for a pregnant woman to have a 4D ultrasound? What kind of help do you want: When is it most appropriate for a pregnant woman to have a 4D ultrasound?Doctor's answer:
Hello, the Down syndrome screening is a method that involves drawing the pregnant woman's blood serum to detect the concentrations of alpha-fetoprotein, human chorionic gonadotropin, and free estriol in the maternal serum. It also combines the pregnant woman's due date, weight, age, and gestational age at the time of blood collection to calculate the risk factor for giving birth to a child with congenital defects.Hello, it is generally recommended not to eat before the Down syndrome screening, as drawing blood on an empty stomach provides more accurate results. This test is used to rule out congenital malformations. If the results of the Down syndrome screening are abnormal, it is necessary to undergo further prenatal diagnosis.