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.
the 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
DNA testing will be used to identify family connections.