The expression "exame de DNA" is used in the Brazilian law on paternity establishment (Law No. 8,560/92). "Teste de DNA" is a widely used general term.
There are multiple definitions - click on the translation that matches your context.
a scientific analysis of someone's DNA from blood or saliva etc to find out whether they have committed a crime or are a particular person's father etc
Nine babies found alive after a gas explosion have undergone DNA tests to help reunite them with their parents.