The ABC feed of the Usa for Africa/"We Are The World" finale does exist in its entirety, full with the network end credits, and can be discovered as a supplemental element on the We Are The World: The Story Behind The Song DVD. The most invasive measures are chorionic villus sampling (CVS) and amniocentesis, which involve tests of the chorionic villus (discovered in the placenta) and amniotic fluid, respectively.