What is a significant marker for identifying trisomy 18 during pregnancy?

What is a significant marker for identifying trisomy 18 during pregnancy?

• A. Increased blood pressure
• B. High levels of amniotic fluid
• C. Presence of certain physical features in fetuses during ultrasounds
• D. Low fetal movement

Answer: (C)

Identifying trisomy 18, also known as Edwards syndrome, during pregnancy often involves assessing specific markers that can indicate the condition. The presence of certain physical features observed during ultrasounds is a significant marker for identifying this chromosomal abnormality. Common features that may be detected include a small head, clenched fists, rocker-bottom feet, and specific cardiac anomalies. These physical characteristics are suggestive of trisomy 18 and can help healthcare providers make a more informed diagnosis.

Other options, while associated with different conditions or complications during pregnancy, do not specifically serve as markers for trisomy 18. Increased blood pressure can be a sign of gestational hypertension or preeclampsia, high levels of amniotic fluid (polyhydramnios) may be linked to other fetal conditions, and low fetal movement could indicate various issues but is not specifically indicative of trisomy 18. Thus, the presence of unique physical features in fetuses during ultrasounds is crucial for the early detection of trisomy 18.