Which diagnostic procedure is anticipated for a fetus diagnosed with omphalocele?

In cases of omphalocele, a congenital defect where the infant's abdominal contents protrude through the abdominal wall at the base of the umbilical cord, karyotyping via amniocentesis is often indicated to assess for chromosomal abnormalities. This is particularly important because omphalocele can be associated with genetic syndromes, such as trisomy 13 or 18. Amniocentesis allows for the collection of amniotic fluid, which contains fetal cells, enabling doctors to analyze the chromosomes for any abnormalities that might influence the management and prognosis of the pregnancy.

While ultrasound examination is crucial for diagnosing omphalocele and monitoring fetal development, it does not provide specific chromosomal information. Fetal echocardiograms are conducted to evaluate possible associated cardiac defects but are not directly related to assessing genetic conditions. Similarly, chorionic villus sampling is a procedure used for genetic testing early in pregnancy but is typically performed earlier than amniocentesis and thus is less common in the context of diagnosing omphalocele specifically after its identification through ultrasound.