To determine the fetal lung maturity, which of the following tests is performed?

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Amniocentesis is performed to determine fetal lung maturity, genetic disorders, and metabolic defects. This procedure is usually done between 13 and 14 weeks of pregnancy. Alpha-fetoprotein is done to determine open neural tube and abdominal wall defects. Chorionic villus sampling detects genetic abnormalities. Fern test is done to determine the presence of amniotic fluid leakage.

To Determine the Fetal Lung Maturity, Which of the Following