What does "low screening risk" mean?
Aug 12, 2023
Source: Cainiu Health
Dr. Lv Aiming
Introduction
In general, a low-risk screening result usually refers to a low risk of Down syndrome, meaning the fetus has a relatively low probability of chromosomal abnormalities. Down syndrome screening primarily involves testing the pregnant woman's venous blood to measure the levels of maternal serum markers including alpha-fetoprotein, human chorionic gonadotropin, and unconjugated estriol, combined with factors such as the pregnant woman's weight, age, and gestational age for assessment.
Generally, a low-risk screening result usually refers to a low-risk outcome in Down syndrome screening, meaning that the risk of fetal chromosomal abnormalities is relatively low. The detailed explanation is as follows:
Down syndrome screening primarily involves testing the pregnant woman's venous blood to measure the levels of maternal serum markers, including alpha-fetoprotein (AFP), human chorionic gonadotropin (hCG), and unconjugated estriol (uE3). These results are combined with factors such as the mother’s weight, age, and gestational age to comprehensively assess the probability of the fetus having congenital disorders such as Down syndrome (trisomy 21) or neural tube defects. In terms of ultrasound examination, the primary method is measuring the thickness of the fetal nuchal translucency to evaluate the risk of Down syndrome. A low-risk result from the screening indicates that the assessed risk of the fetus having Down syndrome is low. This risk assessment is typically expressed as a probability or percentage.
In summary, a low-risk result generally indicates a lower likelihood of fetal chromosomal abnormalities. However, it is important to note that Down syndrome screening is only a screening test, not a definitive diagnosis. If there are any questions or concerns about the screening results, it is best to consult a healthcare provider for further guidance.
