Of the following methods for prenatal detection of genetic disorders,which one cannot be completed until early in the second trimester and can take an additional two weeks for test results?

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Amniocentesis cannot be completed until early in the second trimester (around 15-20 weeks of pregnancy) and can take an additional two weeks for test results, compared to chorionic villus sampling which can be completed earlier in the first trimester. Ultrasound is used for visualization of the fetus but does not provide information on genetic disorders. Genetic imprinting is a phenomenon related to the expression of genes and is not a method for prenatal detection of genetic disorders.

Of the Following Methods for Prenatal Detection of Genetic Disorders,which