Which test is performed as early as week 5 and allows access to the fetal circulation and direct visualization of the embryo,permitting the diagnosis of malformations?

Question

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Embryoscopy is performed as early as week 5 and allows access to the fetal circulation and direct visualization of the embryo, permitting the diagnosis of malformations. Amniocentesis and chorionic villus sampling (CVS) are performed later in pregnancy and involve obtaining a sample of fluid or tissue for genetic testing. Sonoembryology is not a commonly used test but refers to the use of ultrasound to study the developing embryo.

Which Test Is Performed as Early as Week 5 and Allows