What is a primary reason for performing amniocentesis later in pregnancy?

Amniocentesis later in pregnancy is primarily performed to assess fetal lung maturity and fetal well-being. As the pregnancy progresses, particularly after the 34th week, assessing the maturity of the fetal lungs becomes crucial, especially if there are concerns regarding preterm labor or other complications that may require timely delivery of the baby. The analysis of amniotic fluid can provide important information about the levels of surfactant, a substance that aids in lung maturity.

In addition to lung maturity, performing amniocentesis at a later stage helps evaluate overall fetal health. This can include assessing for any potential complications that may arise as the pregnancy nears term, ensuring that the fetus is thriving and ready for delivery.

This focus on lung development and fetal health is particularly important for making informed decisions regarding timing and delivery methods if risks arise, such as in cases of maternal health issues or signs of fetal distress.